Removed class RecordedTestFSceme from RecordedTests.cs

Until now we kept both classes because FScheme based tests were running on Master (0.6.3) but now that it is not required

I have already moved all tests from RecordedTestFSceme class to RecordedTestsDSEngine class (by creating region "Test Moved from FScheme") and changed their evaluation to DSEngine.
Merge pull request #1564 from riteshchandawar/MasterNew

Removed class RecordedTestFSceme from RecordedTests.cs