update CategoryCounts, FollowUp and Category border on general Tag Event
use most severe category if multiple categories are present for a file
enforce category ordering via enum declaration order
-remove unused code from Category.java
-use Category.isCategoryTagName instead of .getDisplayName().startsWith(Category.CATEGORY_PREFIX)
-regroup when notified of Tag Change from autopsy
For speed, now stores hash set hits in memory.
Fixed bug where hash hit count would never update after a group was created, even if files were added/removed
Changed category zero count to be bases on other counts and not stored separately.
- Keep some file data in memory to avoid excessive database queries (list of image file IDs, image/video, and category counts)
- When categorizing/tagging a group, don't create tiles (including thumbnails) for images that aren't on the screen
- Changed locking around Category and Tag listeners to prevent slowdown/deadlocks
