Add external libs for comparisons and benchmarks.

extern/CMP_Core/test/TestsMain.cpp

@@ -0,0 +1,10 @@
+#define CATCH_CONFIG_RUNNER
+#include "../../../Common/Lib/Ext/Catch2/catch.hpp"
+#include "CompressonatorTests.h"
+
+int main(int argc, char* argv[]) {
+	AssignExpectedColorsToBlocks();
+	int result = Catch::Session().run(argc, argv);
+
+	return result;
+}