some fixs for singleplayer mode

fix a gap could teleport to front position in stage 3
fix stage 2 nuke logic won't detect zombie
nerf stage 2 screw's health
boost a bit for mita chasing

add singleplayer detect,trigger while under 5 player in map
but i still Not recommended to play this map offline

fix stage 2 boss's ring duck ability get instant kill when spawn
a little boost for mita chasing speed

delay stage 1 first zm tp 5 sec

·fix stage 3 final dark room's door could open directly by press E
yep its bug,not my design,you have to defend few spot and get chase by mannequin mita.

add extra teleport at top of stage 2 boss rooms
zombie chainsaw boost now will delay 1 sec after used
zombie chainsaw duration nerf 6 sec -> 5 sec

fix some stuck zm tp spot
fix stage 3 final escape door get blow up with nades
add airwall in stage 1 minigame avoid item drop outside

uh

Created ze_MiSide.