General: Normalize RuntimeCommon include paths

Performs the same normalizing done to the RuntimeCommonB target, now all
of the runtime headers have normalized include paths.

Runtime/Character/CPrimitive.hpp

@@ -1,7 +1,9 @@
 #pragma once
 
-#include "IOStreams.hpp"
-#include "RetroTypes.hpp"
+#include <string>
+
+#include "Runtime/IOStreams.hpp"
+#include "Runtime/RetroTypes.hpp"
 
 namespace urde {