Minor restructuring for tests, initial work for sync tracks.

tests/SyncTrackTests.cc

@@ -0,0 +1,5 @@
+//
+// Created by martin on 16.11.21.
+//
+
+#include "catch.hpp"

tests/main.cc

@@ -0,0 +1,8 @@
+#define CATCH_CONFIG_RUNNER  // This tells Catch to provide a main() - only do this in one cpp file
+#include "catch.hpp"
+
+int main (int argc, char* argv[]) {
+  int result = Catch::Session().run(argc, argv);
+
+  return result;
+}