E2: Block pp/copy exploit

I've only modified the E:setMaterial function here, I don't think the exploit is possible with holograms so I did not add any checks in the hologram functions.
Damage Detector: Added "Reset" input
Damage Detector: Fixed #272
EGP: Fixed egpScrSize, egpScrW, egpScrH returning strings
Fixes #276, Divran tracked it down