Option to spawn souls from gun kills

* Added the requisite code to each DECORATE monster
* Controlled by the ds_gunsouls CVAR, defaulted to off
Sword Tweaks

* Reduce startup & cooldown on charged launcher
* Remove negative recoil from launcher to prevent overshoot when air chasing
butts.txt
Apparently this is going all over the internet, so.
oops
Merge pull request #12 from ShiftyAxel/gunsouls

Option to spawn souls from gun kills
Merge pull request #15 from ShiftyAxel/sword-tweaks

Sword Tweaks
stuff
ds_gunsouls now changed from ACS-based to inventory-based for less packeting.
Add CVar to enable original Doom health mechanics

* Disables health token system when enabled
* Added logic to set health tokens as a function of player health
* Added CVar-aware spawners for Doom health and armour pickups
* Changed player damage resistance to 0.5 to compensate for OHGODTHEPAIN
* Improves balance in mods designed around the original health system