Removes buildable HPAD from gdi01
Added my fullname to AUTHORS
Merge pull request #3587 from dan9550/td_nod_campaign

Fixes HPAD being buildable in gdi01
Add WAngle.ArcTan().
Add Gaussian sampling functions to WRange, WVec.
Convert ProjectileArgs to world coords.
Split TeslaRenderable out from TeslaZap.
Rewrite GravityBomb with world coords and gravity.
Rewrite bullets using world coords and improved trails.
Convert Missile to world coordinates.