Refactors the media file upload component into
a shared component to be used in both normal pages
and dialogs.
A dialog was addes into the media file "edit" view
to upload and set attachments on the fly.
- add a 'lock' symbol to hidden files
- default disable (and rename) hidden filter status
- limit display of workflow states for restricted users
- remove supporter sorting
- mark other strings for translation
- fix new workflow id for statute amendments
- remove csv file type check (on Windows file type is always empty)
- Projector base template
- Projection button
- projection dialog
- motion slide (template and motions/projector.py)
- user slide (template and users/projector.py)
- motion and user list view with projector column permission check.