ui: implemented prefilling indexed header paths for compilation database projects

* fixed header path detection in CompilationDatabase class

src/lib/utility/utilityFile.h

@@ -0,0 +1,13 @@
+#ifndef UTILITY_FILE_H
+#define UTILITY_FILE_H
+
+#include <vector>
+
+#include "utility/file/FilePath.h"
+
+namespace utility
+{
+	std::vector<FilePath> getTopLevelPaths(const std::vector<FilePath>& paths);
+}
+
+#endif // UTILITY_FILE_H