fix returning of trap monster

fix copy and replace effect

for Acid Trap Hole

add ReplaceEffect

changes

bad range check

Change effect_flag size from 8 to 4 bytes

it breaks effects, like e4 of Venom Swamp, Harpies Hunting Ground

Fix illegal enum forward declaration of effect_flag and effect_flag2

Specifiying the size is mandatory. Fixes the compilation on GCC (debian).

fix

revert