Custom properties are now supported by Pose Library. They will get
saved and restored correctly during previewing and pose adding.
To do this, I've changed PoseLib over from using the "LocRotScale"
Builtin Keying Set to the "Whole Character" one instead. One
consequence of this, is that now entire poses are stored in the Pose
Lib, irrespective of whether you only selected part of a pose to store
(i.e. facial controls only, or hand poses only). If this is enough of
a problem, I'll make a second Keying Set that does take selections
into account, and use that here instead.
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