Refactoring: Remove unneeded public API

Tristan Van Berkomrequested to merge
private-project-refactor into master

This branch removes a lot of unneeded public API:

  • Removed exceptions from public API, except for ElementError and SourceError
    • ElementError and SourceError declarations moved to element.py and source.py respectively, for clearer documentation
  • Removed Mount and MountMap accidental additions to sandbox.py public API, these should never have been public, they are sandbox implementation details
  • Removed Project from public API
    • This required adding a couple of APIs on the Source object to make up for it, but leaves us with an all around leaner API

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