End fix, Pause-Mute, and system names

Fixed the flickering Dayum Shame image.
Changed the instructions and key in-game screens so they no longer pause the music.
Added names to the systems on the Key screens and tweaked the positions of all the graphics therein.
Also centered the Captain's text in the Orders screen.
Merge branch 'Screens++'

Conflicts:
	lib/game/entities/events.js