Refactor

* Minor style changes
* Move function definitions
* Split utility.hpp
* Enable include of export-symbol-helper.hpp in tests

lib/utils/path-helpers.hpp

@@ -0,0 +1,12 @@
+#pragma once
+#include "export-symbol-helper.hpp"
+
+#include <QString>
+#include <string>
+
+namespace advss {
+
+EXPORT std::string GetDataFilePath(const std::string &file);
+QString GetDefaultSettingsSaveLocation();
+
+} // namespace advss