SSG pickup sprite not required

we do not expect to find the weapon in-game anyway
cap the scale in R_ScaleFromGlobalAngle() at a higher value
colored blood is disabled in Hacx and Chex Quest
check if a lump is *not* from a PWAD

this adds a "path" field to struct _wad_file_s
that can be used to track the origin of a given lump

this, in turn, is used to check if specific sprites
of the monster death frames come from PWADs and have
thus replaced the original sprites

if this is the case, colored blood is disabled.

fixes #37