Merge pull request #73 from IjonTichy/upstream

Recode of CVar buff and ban system
As tempting as the idea is to implement cvars for third-party-addon buffs/nerfs, nobody plays 0.3 with addons yet so. (ACS NOT COMPILED)
Damage amended to be more appropriate to Marathon.
Timon's Axe no longer refuses to take ammo when a hit is made with full ammo in coop.
As per PresidentPeople's request, Duke's taunts now check for DukeClass. (fixes #74)
Okay seriously now the Quad Damage will work in singleplayer ZDoom
 Manathor armor no longer goes 100 -> 150 -> 300 -> 300 with yellow armor in the map

 + ARMOR_MEGASPHERE added for finer granularity with armor types given
 + Yellow armor with armor mode 3 (old quake) is now red armor
 + Blue armor with armor mode 3 + yellow armor is now silver armor, not red armor
   (this makes the progression yellow -> red -> silver -> silver,
      instead of yellow -> yellow -> red -> silver)
     (without yellow, it's still yellow -> red -> silver)