Add .gitignore and autogen-clean.sh
Add missing headers for newer compilers
Do not overwrite on install
Add debugging condition to title.cpp
Minor SuperTux speed tweak (gcLinux)
Const cleanup
Replaced some sounds with unclear copyright with new ones from 0.3.x
Optimize files for size
Fix supertux.desktop
Remove extra qualification from menu.h
Reduce delays in menus for smoother scrolling
Add command line option for window mode