Ouroboros

This release marks first and hopefully last full rewrite of szurubooru.

New features

• Post notes (little text annotations to posts)
• Tag categories
• Tag banning
• Tag implications
• Manual tag removal
• Manual tag suggestions
• Comment scoring
• New frontend
• Improved keyboard navigation

Permanently removed features

• Permissions with regard to specific post safeties
• Tag auto-removal (tags now hold too much information to remove them automatically)

Regressions

• Removed API documentation

Architectural changes

• Full-blown JS frontend
• Proper dependency injection (no more static classes)
• Removed API layer in favor of controllers. This is probably only temporary.