Fixes#382
- to alleviate the above issue I saved the current sound from each channel in the cutscene runner and serialize r/w appropriately.
- also made a new channel for Ambient Sounds called CH_AMBIENT. there are now 3 total channels CH_GLADOS, CH_MUSIC, and CH_AMBIENT
the only issue that is remaining is because we are relying on cutscene runner to que up the ambient sounds, the ambient sounds dont start until a cutscene starts on a level. this could be alleviated by making a trigger in the starting elevator of each level that simply triggers the ambient sound to play.
- simply added the ambient_base sound to the game. its actually a very small sound file, so we could layer on other ambient sounds on top that are queued by different parts of the level in the future if we wanted.
- because this is an activeSound it is also effected by the bug where if you save and reload it is no longer playing (just like the current glados voice line activeSound)
- tested in entire game seems to work well.
- added 3 new songs and triggered them at appropriate moments according to the wiki
- made a new CH_MUSIC channel for music
- adjusted music volume to be initialized at 50% which seems like the right volume to match the original game.
- tested the entire game to make sure its all working properly.
- if the game was saved while the cutscene runner had queued audio lines, when that save was loaded it would crash the game.
- to alleviate I simply deny the player to save while a cutscene audio is playing with the "deny" sound.
- also relieved a bug where audio volume would not be correct after loading a save, by simply updating the volume when a queued level is loaded.
we could probably find the true solution to this crash and allow players to save during a cutscene, however I think this workaround is good for now to avoid crashes.
