IWYU scrap.c
Add include guards
IWYU shlmisc.c
IWYU shootblast.c
IWYU tech.c
IWYU toggle.c
IWYU toxicity.c
Add include guards and fix up copyright header for tweakables.h
Fixup header on vars.h
IWYU victory.c
IWYU zoom.c
IWYU VN.c
Add missing includes for analysis.c
IWYU enrol.c, ANSI function declarations