AddonManager

- Categories now filter addons in the Addons tab
- Moved addon manager's minimap button to the minimap tab
- Minimap buttons tab is now translatable
- Added support for new addon minimap buttons
- Added mouse wheel scrolling for pagination
- Command view and tooltips support single slash commands
- Added tooltips for settings in the Addon Manager
- Settings changes apply on the fly
- Added input validation and default icon handling
- Standardized tab icons to equal resolutions