Blender Git Loki

Pseudo-fix for ARMATURE_OT_autoside_names and x-mirror

It now works like 2.7x. That said this operator is kind of incompatible with
x-mirror (the way it is implemented anyways). But if people were happy with
this in 2.7x they will be multi-object happier.

That said, do turn off x-mirror before using this or select all bones, or just
stop using this operator altogether ;)

Jokes aside, the operator can also be fixed. It shouldn't be hard.