reseeds rng before each test case and provides access to seed through Catch::rngSeed() function

include/internal/catch_test_case_registry_impl.hpp

@@ -90,6 +90,8 @@ namespace Catch {
                     break;
                 case RunTests::InRandomOrder:
                 {
+                    seedRng( config );
+                    
                     RandomNumberGenerator rng;
                     std::random_shuffle( matchingTestCases.begin(), matchingTestCases.end(), rng );
                 }