CBurstFire: Tidy up includes

Includes all necessary headers and uses a forward declaration where
applicable. Ensures inclusion changes in other headers don't break the compilation
of these headers and source files.

Runtime/Weapon/CBurstFire.hpp

@@ -1,8 +1,12 @@
 #pragma once
 
-#include "CStateManager.hpp"
+#include "Runtime/GCNTypes.hpp"
+#include "Runtime/rstl.hpp"
+#include <zeus/CVector3f.hpp>
 
 namespace urde {
+class CStateManager;
+
 struct SBurst {
   s32 x0_randomSelectionWeight;
   s32 x4_shotAngles[8];