Issue #2843871 by nehakhadke: Remove @file tag docblock from all the .php files
Remove usage of $this->t() when not in a class
Issue #2843872: Use $this->t() instead of t() in classes
Issue 2272791: Compatibility with Swiftmailer and different Mailing modules
Removing all calls to mailsystem_set as this should be set be the user in the Mail System module settings.
Issue #2072437: Move token hooks to .inc file
Removed mailsystem_set which no longer exists.
Replaced obsolete mime_header_decode/encode with Unicode::mimeHeaderDecode/Encode.
Fixes for issues revealed when enabling the Mime Mail module.
Issue #2827710 by joelpittet: Should set "checked" using .prop() instead of .attr()
Better handling of user input in preview step - missed the file name.
Better handling of user input in preview step.
Updated changelog for 7.x-1.2
Issue #2237585: Make allowed file extensions for attachments configurable
Issue #2368533: Bypassing views render layer breaks all sort of things
Renamed internal helper function.
Issue #2693393: Mailsystem 3.x-dev requires "key" and "module" keys in the mail message
Improved messages about token replacement.
Improved help for tokens in general and fixed help for tokens from Token module (no longer using _theme).
Fixing redirect after completed batch job.
Fixed (Views Send specific) token replacement.
Fixing help for tokens (no longer using _theme and hook_theme).
Fixing config saving ("remember these values") and hiding of output.
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