only downwards terrain is supposed to have a transparent floor
made monsters on different z-levels (other than the currently viewed) appear in light gray
monsters will see you on different z-levels now (corrected map::sees)
Updates mapdata.cpp for stone walls.
Tiles.
mapdata.h
Missing initializer.
Update iexamine.cpp

Create action for water coolers.
Update iexamine.h

Add cooler function
Update boxing.json

Add cooler place_special
Add cooler pointer
Merge remote-tracking branch 'IOSYN/Boxing'
Merge remote-tracking branch 'Rivet-the-Zombie/updates-mapadata-cpp-for-stone-walls'

Conflicts:
	data/json/terrain.json

Resolved
Merge remote-tracking branch 'BevapDin/official-z-level'