v0.4 update

New in 0.4
- Minor shotgun sprite changes
- Changed SSG and BFG sprites
- Added knuckle crack on game start
- Changed select animations
- Restored Chainsaw pickup sprite
- Changed BFG's trail effect
- Barrels can be thrown (only with berserk)
- Nerfed zombiemen and commandos
- New monster: Ghoul (from Legacy of Rust)
- Restored Pain Elemental frames (for Freedoom compatibility)
- Lost Soul's sprites are now vanilla ones
- Added new skill: Bring me more! (HMP, but quite harder)
- Replaces WolfensteinSS with Evil Marine (serving as universal SS replacement)
- Added HUD (Brutal Doom Basic HUD, with minor edits by me)