Add helper shortcut to 'renderdoccmd test' to run functional tests

* This invokes run_tests.py with any arguments but specifies the renderdoc
  module and python module paths automatically. Only works if built within the
  project repo itself as otherwise it won't locate the test script

renderdoccmd/renderdoccmd.cpp

@@ -799,7 +799,13 @@ struct TestCommand : public Command
   TestCommand(const GlobalEnvironment &env) : Command(env) {}
   virtual void AddOptions(cmdline::parser &parser)
   {
-    parser.set_footer("<unit> [... parameters to test framework ...]");
+    parser.set_footer(
+#if PYTHON_MINOR_VERSION > 0
+        "<unit|functional>"
+#else
+        "<unit>"
+#endif
+        " [... parameters to test framework ...]");
     parser.add("help", '\0', "print this message");
     parser.stop_at_rest(true);
   }
@@ -826,6 +832,10 @@ struct TestCommand : public Command
 
     if(mode == "unit")
       return RENDERDOC_RunUnitTests("renderdoccmd test unit", convertArgs(rest));
+#if PYTHON_MINOR_VERSION > 0
+    else if(mode == "functional")
+      return RENDERDOC_RunFunctionalTests(PYTHON_MINOR_VERSION, convertArgs(rest));
+#endif
 
     std::cerr << "Unsupported test frame work '" << mode << "'" << std::endl << std::endl;
     std::cerr << parser.usage() << std::endl;