Cleaned up gate searching and categories
Cleaned up gate searching and categories

Searching:
* Removed search result slider (because it's no longer needed)
* Search box now tells you it's a search box
* Hitting enter after searching selects the top search result
* Cleaned up search list sliding animation code

Category tree:
* Left clicking a gate category now expands/collapses it (you no longer
need to click the tiny +/- icon)
* All gate categories will be loaded immediately instead of waiting for
you to open them.
* Removed "Gates" spam from category names. We already know it's a gate
category.
* Sorted categories alphabetically.

CaptainPRICE/wire,sammyt291/wire,wiremod/wire,Python1320/wire,immibis/wiremod,notcake/wire,rafradek/wire,bigdogmat/wire,dvdvideo1234/wire,garrysmodlua/wire,mitterdoo/wire,thegrb93/wire,NezzKryptic/Wire,Grocel/wire,mms92/wire,plinkopenguin/wiremod