General: Normalize several headers' include paths

Normalizes the include paths and makes them consistent. Also adds any
missing includes relevant to the interface.

Runtime/GuiSys/CHudVisorBeamMenu.hpp

@@ -1,13 +1,15 @@
 #pragma once
 
-#include "RetroTypes.hpp"
 #include <cfloat>
 
+#include "Runtime/RetroTypes.hpp"
+#include "Runtime/rstl.hpp"
+
 namespace urde {
 class CGuiFrame;
-class CGuiWidget;
-class CGuiTextPane;
 class CGuiModel;
+class CGuiTextPane;
+class CGuiWidget;
 
 class CHudVisorBeamMenu {
 public: