Portal Gun V2

changes:
+added weapon graphic
has 2 color variants; changes automatically
+better PC controls
seriously, they don't even use RC!
*Valid surface checking is unintentionally different
now works on any surface that passes the color check (min(R,G,B)>0.3)
+copypaste-friendly emancipation grills
still don't block portal shots, sorry.

Future improvements:
Lasers.