E2 PreRelease

Episodes 1 and 2 should be playable to the end but expect lag currently in spots on E2.
Updated to FreeDoom's current git build for resources such as graphics and yet to be edited maps are now from the current git instead of FreeDoom v0.12.
Added higher quality sound effects, and every level has its own music now as it should.
Fixed Demo 2 crash.
Ep 4 enabled in menu but don't expect the maps to work yet.
Added Saturn Style Transparency effect.