Merge branch 'dynamic_egos' into 'master'

Removable egos

Recently there was a talk on IRC how sweet would it be to be able to strip egos from an object. This achieves just that, keeping a list of egos at each object, too!
As a nice bonus, it showcases its capabilities by converting Imbue Item and Reshape Weapon/Armor to slap egos onto objects (and in the second case, to strip them from objects, too).
Randarts now have egos, too, and even randart stat powers are hoarded together by the name and converted into egos. Overall it's pretty sweet.
Of course, this is not limited to objects in its applications. Imagine: SHAPESHIFTING ACTORS.