Improve unit testing directory structure

Separate Qt tests and gtest tests
Add a basic shadow of the project structure
Add a few simple tests to demonstrate usage

tests/src/App/Branding.cpp

@@ -0,0 +1,7 @@
+#include "gtest/gtest.h"
+
+#include "App/Branding.h"
+
+TEST(Branding, one){
+    QString ss {};
+}