fix FS1 (de)briefing voices, the directory names are different in FS1

fix FS1 (de)briefing voices, the directory names are different in FS1
hard code the table values so that the fs1.vp file isn't needed
hard code a mission fix for sm2-08a since a have no idea how to fix it otherwise
generally cleanup some FS1 code
fix volume sliders in the options screen that never went all the way up