Weapon particles and FX fixups round 1

[redrumrobot]

• verysmallrock: lighting diffuse, small chunks, faster travel
• blaster: particles don't show up when very close
• shotgun: small shot holes impact mark, hot slug/shot fade. Fix shell casing eject, model orientation, slower speed, less bounce
• pain saw: impact particles should fade out not in, 'hot spark' look with smaller sparks
• rifle: reduce dlight flash, fix brass eject
• lasergun: recolor lazors and impact particle, smaller and less bright dlight flash on hit (laz0r light is tight)
• mass driver: Reduce particles to 3 or 6, make them more like a bolt instead of dot, fade out fast, no bounce
• chaingun: fix brass ejector location (move right and closer to camera) and lower magnitude
• flame thrower: less uniform scorch mark, start smaller
• pulse rifle: smaller impact mark
• lucifer cannon: primary eject fewer and smaller fast primaries only, fade faster. secondary no ejector. primary impact, only primary particles ejected. secondary impact, only red particles ejected
• lightning gun: new impact marks
• grenade launcher: smoke trail for launched nade
• portals: stronger contrast on portals, extend inside of the ring over portal surface (polygonoffset?), offset gfx for imperfect overlap (to fix both-color washout), remove pixel junk at edge of portal ring, fewer orange and blue mini particles with no bounce