Issue #2621210: File with term data.
Issue #2621210: Exporting terms.
Issue #2624404: Refactoring SubTreeController.
Issue #2624404: Major update removing old js files.
Merge branch '8.x-1.x' of git.drupal.org:project/taxonomy_manager into improvement/2624404-code-cleanup
Issue #2624404: Single line methods chain.
Added basic term data form, still needs work when submitting the form.
#2624404 Fixing identation
Fixed missing storage controller on delete and move form.
Use objects injected via the container where possible and exchanged entity manager with entity type manager.
Prepared move terms form, move operation itself not yet implemented.
Added helper function for generating modal forms.
Fixed form state cache expception, if add form is embeded on the main taxonomy manager page (GET request).
Fixed escaping of vocabulary name.
Removed any custom CSS (code from D7).
Fixed escaping of term name.
Fixed setting the parents.
Fixed ordering of terms (wrong sort for weight).
Removed outdated code from taxonomy_manager.module file.
Added missing file.
Added delete operation.
Fixed passing the selected parents for add modal.
Added 'add' form using the ajax modal API. Does not yet work to add new terms as child terms of selected parents.
Removed dotted border on tree element.
Removed obsolete D7 code.
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