Added editor shortcuts. Game no longer blocks editor keypresses in test mode.

Added graphics from animation example docs for testing to multiplayertest.

f1-4 to open respective tabs (excluding tiles because it has its own set of shortcuts, but you can enable it in globals.lua if you want)
Hitting pause(esc) in test mode no longer exits test mode.
Tab toggles the editor open/close, doesn't lose which tab it was left on.
To enter/exit test level mode at any time hit ctrl+t.
Merge branch 'master' of https://github.com/GoonHouse/Marin0SE