Merge Core library into Library, as with its utility functionality merged into Arbutils, it's becoming less and less useful.

src/Library/Exceptions/NotImplementedException.hpp

@@ -0,0 +1,12 @@
+#ifndef CREATURELIB_NOTIMPLEMENTEDEXCEPTION_HPP
+#define CREATURELIB_NOTIMPLEMENTEDEXCEPTION_HPP
+
+#include "CreatureException.hpp"
+
+class NotImplementedException : CreatureException {
+public:
+    NotImplementedException(std::string error) : CreatureException(error) {}
+    NotImplementedException() : CreatureException("Not Implemented") {}
+};
+
+#endif // CREATURELIB_NOTIMPLEMENTEDEXCEPTION_HPP