Expand Testing: Compare Code dialog

[KeyWorksRW]

Description:

The Compare Code Generation under the Testing menu needs to be extended. It should add support for Ruby and XRC code generation. Project.GetOutputType() should be used to disable radio buttons that would have no effect (e.g., there's no point in comparing Python files if none of the forms have a prop_python_file specified).

[Randalphwa]

Comparison for Ruby has been added, but it's still missing XRC comparison.

Since this is for testing, and in most cases multiple languages are being tested (i.e., SID or QuickTest), I don't think disabling buttons for the other languages is important.