Fix monster trapped state being wrong

When cloning a monster, clear the clone trapped and hiding states.
When splitting a monster (eg. a black pudding), the clone could
be placed on a trap, so do mintrap.
When removing a monster from the map, clear the trapped state.

doc/fixes36.2

@@ -422,6 +422,8 @@ Vlad wasn't set up as a vampshifter properly
 poly'd hero capable of spitting venom would leave intact venom object if it
 	reached end of range at a 'soft' location such as water
 avoid impossible if monster cannot be relocated from teleport region
+fix cloned monster trapped and hiding states
+split monster could be placed on trap without triggering it
 
 
 Fixes to Post-3.6.1 Problems that Were Exposed Via git Repository