Test movement

This moves the tests from the "/test" folder to "Editor/tests". This allows the UnityTestTools package to access the tests. The Editor folder places the test code in the Editor assembly, thereby giving it access to NUnit and keeping it out of an actual build.

Notes:
- This also comments out (but doesn't delete) the TestBindingAsPoolFacad test. It does not compile. Is there a historical reason for keeping it around?
- The Implicit Binding Tests are broken by this change. I have a potential fix (allowing the assembly the ImplicitBinder pulls from to be set) that I will make another Pull Request for if this one is applied.