Inline all AddSound paths

[garethyr]

AddSound allows you to do

AddSound = ContentFile
	FilePath = Path/To/File.flac

or

AddSound = Path/To/File.flac

The latter saves some lines and should be swapped to consistently in base content.

[Causeless]

@pawnishoovy Think we should do this, and does it make sense to get this done?
(If we do this, should do in it's own branch and merge into dev, we can't stick everything in browncoat-lmg)

[pawnishoovy]

we should do this for tidiness' sake but probably after everything else is done so we can just do it all at once and get it over with.