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Sculpt: Enable symmetrize operator with Dyntopo disabled

After refactoring the mirror modifier and supporting geometry modifications with PBVH_FACES this operator can be easily implemented without Dyntopo.
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The symmetrize button and options are still in the Dyntopo pannel. There are patches like doing multiple modifications in the Sculpt mode UI, so we need to find a way to organize this better.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D6180