This is just a cool little hack that helps you pay better attention to what
you're shooting at.  If most any source of light gets caught in the
crossfire, it changes into a slightly-beefed-up demon, imp, trooper, or
sargeant (e. g., the object that turns into a demon has 200 hit points
instead of 150, and its speed is 12 instead of 10).  The objects I've
patched are...naw, that would take the fun out of it.

Thanks to Jason Gorski for the original idea in lamp2imp, which replaces
lamps with imps that are quite a bit harder to kill off than the imps
defined in doom.exe.  I've changed more light sources, and they do not
change to monsters until they've been injured.  Also, my new monsters do
not count toward the kill percentage.

Well, enjoy.

Jeff
