Ports verb-optimizations from /tg/

The examine, pull, and point verbs now below to the mob instead of all atoms. Based on discussion here: http://www.byond.com/forum/?post=1326139&page=2#comment8198716
As a bonus ghosts can now point. Ghost pointing should only be visible to other ghosts unless made visible by cult activities.
All the relevant examine changes.
Merge pull request #6939 from PsiOmegaDelta/VerbOptimization

Verb optimization
Merge remote-tracking branch 'upstream/dev' into Ghosts

Conflicts:
	code/modules/mob/dead/observer/observer.dm