- add a cd_shared.c inspired by darkplaces, which implements the CDAudio interface and will either play the ogg music or call the hardware CD code
- set default sound speed to 44100 Hz. this will be necessary to make music sound decent. (unfortunately the resampling code sucks, i think, so the 11025 hz sound effects sound bad when resampled to 44100, but that should be easy to fix.)
Don't require the player to be dead for the 'autoload' console function to work.
Reset autoload info on 'map' and 'changelevel'.
Add future ideas for autosave criteria.
