Clean up render and UI

 - Shorten highlight label message (as to what @WhiteHalmos said in #39)
 - Add whitespace next to operators and some other general cleanings
 - UI no longer changes highlight square when not clicking on the board (for example, clicking on the pause button used to highlight (0, 0))
 - Highlight sprite no longer blocks everything under it like arrows and robot hps when not animated
 - Change label colors (#43)