MediaCMS

Feat:

• adds MediaPermission model, will be used for setting custom Permissions on media
• adds API for bulk actions, and helper methods. Some were implemented, others are still placeholders
• refactored files/models and files/views, from single files into folders.. files/models.py and files/views.py stay for reference
• adds ALLOW_ANONYMOUS_USER_LISTING (true by default) setting

Docs:

• uses docker compose in the examples, instead of docker-compose
• introduces Media Permissions docs page

Fixes

• always set the whole number of media of Category (independent of permissions)
• Category image listing: prioritize existing icon over auto-assigned one
• include version on all js files loaded (to avoid caching)