* Add option to cache item grid rendering
* Fix highlighting for bookmarks
* Tweak GL state slightly
* Fix focus box being in the wrong place
* Fix flickering for one frame when searching
* Prevent potion effects from rendering over NEI slots
Fixes#231
* Invalidate the buffer if `invalidSlotMap` changes
* Clean up imports
* Delay blitting until after the buffer is refreshed
but still avoid waiting for the next frame
* Refactor slot focus logic to handle highlighting multiple slots
* Refresh grid when sorting bookmarks
* Minor code cleanup, fix some more hovering issues
* Remove `slotNeedsOutline`, it is now redundant
* Remove focus parameter from drawItem
Jason Mitchell