Fixed typos and made all assert functions optional

src/modelinfo/SimpleModelInfo.h

@@ -50,6 +50,4 @@ public:
 		m_atomics[2] = (RpAtomic*)m; }
 };
 
-#ifdef CHECK_STRUCT_SIZES 
-static_assert(sizeof(CSimpleModelInfo) == 0x4C, "CSimpleModelInfo: error");
-#endif
+VALIDATE_SIZE(CSimpleModelInfo, 0x4C);