Temp folder for model imports is never cleared out

[JamesTKhan]

On model import, model files and dependencies are moved into the .mundus temp directory in users folder. I am not sure why the temp directory was needed as I did not write that part of the code (located in importToTempFolder method, ModelImporter.kt).

One way or another the cache should be cleared at some point. First we need to determine why the temp folder is needed or if we can bypass that entirely.