Meshwap optimization: migrate to geo node instancing

[TheDuckCow]

Be able to use dupliverts to add blocks instead of raw duplicating values. This will make playback much faster, save disk space, and also just process quicker. One challenge: dealing with rotations of objects. Solution: for a single block type, have a single set of dupliverts per orientation.

Forked from original issue.

[TheDuckCow]

While this was a solid idea back in the day, we would be much better served via some replacement in geometry nodes. Renaming to account for this.