Fix for Python >=3.8 dll discovery #21
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Since Python 2.8 DLL discovery on Windows has changed and thus the add-on fails to install as Python cannot load VTK DLLs.
This change introduces an environment variable VTK_DLL_PATH that needs to explicity point to the direcotry with VTK.
The varablie should be set to something like: C:\Program Files (x86)\VTK\bin (or wherever users VTK installation is located).
This should remediate the bugs with DLL not loading on Windows in later versions of Blender.
Works with Blender 3.4 and Python 3.10