Split addon code into modules (#486)

* adding maxxon paths
* split into modules
* more module separation
* more separation
* separate ui
* more cleanup
* cleanup paths
* remove ignores and attributes
* add a manifest
* fix import error with polygroups
* fix vertex color export and improve performance
* numpy performance test
* Revert "numpy performance test"
This reverts commit 5c9ada6.
* improve UV map export
* fix import
* fix error output; update version

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Co-authored-by: dg <>
Co-authored-by: dan <{ID}+{username}@users.noreply.github.com>

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.gitignore

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+__pycache__