Implemented proper HUD rendering, along with toggling and resizing. Works just like in UT now.
Added "extended" version of the Beta menu music, quickly put together in OpenMPT. I really like it.
Added M_DOOM graphic and changed the titlemap texture.
Made various screen graphics additive now that I know how to.
Separated pickup and first person brightmaps for Pulse Gun, this is needed for beta skin packs (there will be skins for the Pulse Gun, Redeemer and Impact Hammer).
