63af8dbfca
These updates are used to recalculate normals and average values between grid boundaries during multires sculpting. In main the affected faces are passed as an array of pointers. Using an `IndexMask` instead reduces memory usage by 4x per affected face (8 byte pointer to 2 byte integer), simplifies iteration and threading, and can also improve performance. Finding which faces are affected is now multithreaded, with its runtime changing from 0.63 ms to 0.12 ms in a simple test sculpting on a portion of a 1 million face grid. Also switch to VectorSet instead of GHash for finding affected adjacent elements. That's a friendlier data structure that probably has better performance as well.
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