Symbol fixes, headers & main progress

Former-commit-id: 6944a14e89

include/GuiSys/CGuiSys.hpp

@@ -6,6 +6,9 @@
 class IFactory;
 class CSimplePool;
 
+class CGuiSys;
+extern CGuiSys* gGuiSystem;
+
 class CGuiSys {
 public:
   enum EUsageMode {
@@ -15,9 +18,17 @@ public:
   };
 
   CGuiSys(IFactory*, CSimplePool*, EUsageMode);
+  ~CGuiSys();
+
+  static void SetGlobalGuiSys(CGuiSys* ptr) {
+    gGuiSystem = ptr;
+    spGuiSys = ptr;
+  }
 
 private:
   u8 pad[0x14];
+
+  static CGuiSys* spGuiSys;
 };
 
 #endif