4d841e1b35
Combine the newer less efficient C++ implementations and the older less convenient C functions. The maps now contain one large array of indices, split into groups by a separate array of offset indices. Though performance of creating the maps is relatively unchanged, the new implementation uses 4 bytes less per source element than the C maps, and 20 bytes less than the newer C++ functions (which also had more overhead with larger N-gons). The usage syntax is simpler than the C functions as well. The reduced memory usage is helpful for when these maps are cached in the near future. It will also allow sharing the offsets between maps for different domains like vertex to corner and vertex to face. A simple `GroupedSpan` class is introduced to make accessing the topology maps much simpler. It combines offset indices and a separate span, splitting it into chunks in an efficient way. Pull Request: https://projects.blender.org/blender/blender/pulls/107861
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