setup: Added clang and llvm

Adds clang and llvm include directories and libraries to the build. The
environment variable CLANG_DIR is used to define the location of llvm
and clang. A simple clang tool implementation was added to assure proper
operation of the libraries.

src/app/main.cpp

@@ -7,8 +7,12 @@
 #include "includes.h"
 #include "qt/QtElementFactory.h"
 
+#include "data/parser/clang.h"
+
 int main(int argv, char **args)
 {
+	clang_main(argv, args);
+
 	QApplication qtApp(argv, args);
 	std::shared_ptr<GuiElementFactory> elementFactory = std::make_shared<QtElementFactory>();