Add an option for the lower latency audio mode we had in an #ifdef before
Fix fallthough bugs in isAlphaTestTriviallyTrue
Restore F11 keyboard shortcut for fullscreen (in addition to alt+enter)

Now that the debugger has its own keymap, this should be okay.
Just some formatting/cleanup
swap_control_tear doesn't seem to work out for our timing or something. Let's do regular vsync.