data, utility: Fixes to run Opensource Projects

templateSpecializationArgsAsWritten returning null caused a crash
VisitMemberExprInDeclBody for vardecl was missing
subdirectories for headersearchpaths, that the user does not need to add a hugh amount of folders

src/lib/utility/file/FileSystem.h

@@ -18,6 +18,7 @@ public:
 		const std::vector<FilePath>& paths, const std::vector<std::string>& fileExtensions);
 
 	static std::string getTimeStringNow();
+	static std::vector<FilePath> getSubDirectoies(const FilePath& path);
 
 	static bool exists(const std::string& path);
 	static std::string fileName(const std::string& path);