Trim trailing whitespace.
Fix read of uninitialized memory.

The initial number of copies in ContinuousSound is zero, so the initial
call to ResetCumStat() was not initializing the data before being used
in ApplyCumCommand().

And for those of you who are new to HoverRace development: Yes, those
really are the names that Richard chose for the functions.
Merge branch 'master' into sdl-mixer

Conflicts:
	engine/VideoServices/SoundServer.cpp