Fix coding standard issues.

Great modulel!

The module has many coding standard issues.

$ phpcs --standard=Drupal --extensions=php,module,inc,install,test,profile,theme,js,css,info,txt,md .

FILE: ...on/git_drupal_8.x/modules/contrib/image_popup/image_popup.module
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FOUND 1 ERROR AFFECTING 1 LINE
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 41 | ERROR | [x] Missing function doc comment
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ..._8.x/modules/contrib/image_popup/js/plugins/imagepopup/plugin.js
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FOUND 1 ERROR AFFECTING 1 LINE
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 29 | ERROR | [x] There should be no white space after an opening "("
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...al_8.x/modules/contrib/image_popup/src/Controller/ImagePopup.php
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FOUND 8 ERRORS AFFECTING 5 LINES
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  3 | ERROR | [x] Namespaced classes, interfaces and traits should
    |       |     not begin with a file doc comment
 26 | ERROR | [x] Expected 1 blank line before function; 0 found
 41 | ERROR | [x] Concat operator must be surrounded by a single
    |       |     space
 41 | ERROR | [x] Concat operator must be surrounded by a single
    |       |     space
 42 | ERROR | [x] No space found before comment text; expected "//
    |       |     return [" but found "//return ["
 42 | ERROR | [x] Inline comments must start with a capital letter
 45 | ERROR | [x] No space found before comment text; expected "//
    |       |     ];" but found "//];"
 45 | ERROR | [x] Inline comments must end in full-stops, exclamation
    |       |     marks, colons, question marks, or closing
    |       |     parentheses
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PHPCBF CAN FIX THE 8 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: .../modules/contrib/image_popup/src/Form/EditorImagePopupDialog.php
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FOUND 12 ERRORS AND 2 WARNINGS AFFECTING 8 LINES
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 155 | ERROR   | [x] No space found before comment text; expected "//
     |         |     if (isset($image_element['data-align'])) {" but
     |         |     found "//if
     |         |     (isset($image_element['data-align'])) {"
 157 | WARNING | [ ] Line exceeds 80 characters; contains 105
     |         |     characters
 162 | WARNING | [x] There must be no blank line following an inline
     |         |     comment
 162 | ERROR   | [x] No space found before comment text; expected "//
     |         |     }" but found "//}"
 162 | ERROR   | [x] Inline comments must end in full-stops,
     |         |     exclamation marks, colons, question marks, or
     |         |     closing parentheses
 245 | ERROR   | [x] Functions must not contain multiple empty lines
     |         |     in a row; found 3 empty lines
 247 | ERROR   | [ ] More than 2 empty lines are not allowed
 258 | ERROR   | [x] Expected one space after the comma, 0 found
 262 | ERROR   | [x] Concat operator must be surrounded by a single
     |         |     space
 264 | ERROR   | [x] Concat operator must be surrounded by a single
     |         |     space
 264 | ERROR   | [x] Concat operator must be surrounded by a single
     |         |     space
 264 | ERROR   | [x] Concat operator must be surrounded by a single
     |         |     space
 264 | ERROR   | [x] Concat operator must be surrounded by a single
     |         |     space
 264 | ERROR   | [x] Concat operator must be surrounded by a single
     |         |     space
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PHPCBF CAN FIX THE 12 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...les/contrib/image_popup/src/Plugin/CKEditorPlugin/ImagePopup.php
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FOUND 6 ERRORS AFFECTING 4 LINES
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 24 | ERROR | [x] Expected 0 spaces between brackets of function
    |       |     declaration; 1 found
 24 | ERROR | [x] There should be no white space after an opening "("
 24 | ERROR | [x] There should be no white space before a closing ")"
 81 | ERROR | [ ] Doc comment short description must start with a
    |       |     capital letter
 89 | ERROR | [ ] Visibility must be declared on method
    |       |     "validateImageUploadSettings"
 90 | ERROR | [ ] If the line declaring an array spans longer than 80
    |       |     characters, each element should be broken into its
    |       |     own line
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PHPCBF CAN FIX THE 3 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: ...pup/src/Plugin/Field/FieldFormatter/ImagePopupFieldFormatter.php
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FOUND 10 ERRORS AND 4 WARNINGS AFFECTING 8 LINES
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   3 | ERROR   | [x] Namespaced classes, interfaces and traits should
     |         |     not begin with a file doc comment
  10 | WARNING | [x] Unused use statement
  11 | WARNING | [x] Unused use statement
  13 | WARNING | [x] Unused use statement
 104 | ERROR   | [x] No space found before comment text; expected "//
     |         |     $container->get('entity.manager')->getStorage('image_style_popup')"
     |         |     but found
     |         |     "//$container->get('entity.manager')->getStorage('image_style_popup')"
 183 | ERROR   | [x] Functions must not contain multiple empty lines
     |         |     in a row; found 2 empty lines
 188 | WARNING | [ ] Line exceeds 80 characters; contains 83
     |         |     characters
 188 | ERROR   | [x] No space found before comment text; expected "//
     |         |     $image_style_popup_settings =
     |         |     entity_load('image_style', $image_style_popup);"
     |         |     but found "//$image_style_popup_settings =
     |         |     entity_load('image_style', $image_style_popup);"
 188 | ERROR   | [x] Inline comments must end in full-stops,
     |         |     exclamation marks, colons, question marks, or
     |         |     closing parentheses
 208 | ERROR   | [x] Concat operator must be surrounded by a single
     |         |     space
 208 | ERROR   | [x] Concat operator must be surrounded by a single
     |         |     space
 208 | ERROR   | [x] Concat operator must be surrounded by a single
     |         |     space
 208 | ERROR   | [x] Concat operator must be surrounded by a single
     |         |     space
 208 | ERROR   | [x] Concat operator must be surrounded by a single
     |         |     space