accessing references via their ID now also works for references in containers in active cells
Merge remote-tracking branch 'zini/master' into ptr-improvements

Conflicts:
	apps/openmw/mwworld/containerstore.cpp
fix to previous commit
Merge remote-tracking branch 'zini/master' into ptr-improvements
and another fix for the same issue :(
Merge remote-tracking branch 'zini/master' into ptr-improvements