Make xformers and colmap optional dependencies #110
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With my setup (Mac OS 13, arm64) both
xformersandpycolmapwere not available as prebuilt packages (Xformers is not available for arm64 in general). However they are not used in the basic functionality so it's possible to make them optional.With this small change I was able to run it without these dependencies
I assume that decreasing the amount of core dependencies can generally improve the usability of the code and boost the adoption.