I fixed SoundType to make the project compilable.

I changed the SoundType class to a class instead of an enum to allow the
addition of new sound resource paths for custom resource packs. All the
default Minecraft sounds will be put in the SoundType class as public
static final SoundTypes as I have done with STEP_ON_STONE already.

Sorry about pushing broke code. GitHub was being difficult. I'll try not
to let it happen again.

Signed-off-by: REALDrummer <conman.davey@gmail.com>