Removed kommisar sounds, partly because we're not using them, and partly because that failed sound is going to give me nightmares.
Add .gitignore.
Credits screen modularized and animated.
Extra graphics removed from ScreenHowToPlay.
Replaced the basic screen logo with the OTC version.
Added halftone arrow logo to `ScreenWithMenuElements background`. Fussed with the cloud colors. Getting them close to the marquee concept may require a change in technique that I haven't figured out yet.