Non-trivial copiable object fixes, limited to the engine's itself

not the third parties parts.

source/util/include/frustum.h

@@ -25,7 +25,7 @@ struct frustum {
 	}
 
 	void operator=(const frustum& other) {
-		memcpy(this, &other, sizeof(frustum));
+		memcpy(reinterpret_cast<void *>(this), &other, sizeof(frustum));
 	}
 
 	bool overlaps(const vec3d& center, double radius) const {
@@ -34,4 +34,4 @@ struct frustum {
 				return false;
 		return true;
 	}
-};
+};