SystemTestBase into SystemTestServices lib.
Refactor test method names.
Add a stub system test for sample ui library.
Add new sample tests project. Sample tests now run.
Comment edits.
Merge remote-tracking branch 'origin/master' into MAGN-5402
Add shared assembly info.
Merge remote-tracking branch 'origin/master' into MAGN-5402

Conflicts:
	test/Libraries/Revit/RevitIntegrationTests/SystemTest.cs
	test/Libraries/Revit/RevitTestServices/RevitSystemTestBase.cs
Add shared assembly info to tests sample.
Move test extensions into TestServices...

Move helper methods from RevitSystemTestBase to SystemTestBase.
Cleanup
More assertions in sample.
Update sample system test.

More examples of assertions and use of testing language. Change .dyn
file to rely only on core functionality.
Merge pull request #3046 from DynamoDS/MAGN-5402

MAGN-5402 Separate system test base into its own library.