OculusTrcValidator - specify test to run on commandline (feature request)

The OculusTrcValidator is really helpful.

One feature I'd like to see if to specify which single testcase it should run on the commandline, so you don't have to run all of them each time if you are working on a single testcase which is failing. This is going to be especially helpful when - like mentioned in the documentation - more testcases are added.