add debug render groups

src/render/WaterCannon.cpp

@@ -297,9 +297,11 @@ void CWaterCannons::Update(void)
 
 void CWaterCannons::Render(void)
 {
+	PUSH_RENDERGROUP("CWaterCannons::Render");
 	for ( int32 i = 0; i < NUM_WATERCANNONS; i++ )
 	{
 		if ( aCannons[i].m_nId != 0 )
 			aCannons[i].Render();
 	}
+	POP_RENDERGROUP();
 }