ofPath::hasChanged and ofPath::flagShapeChanged should be public

[c-mendoza]

Is there any reason why ofPath::hasChanged and ofPath::flagShapeChanged are private? ofPath::flagShapeChanged() could be really useful when paths are changed externally (I'm currently working around it by calling ofPath::getCommands() only so that ofPath::flagShapeChanged is called), and ofPath::hasChanged doesn't get called at all anywhere in OF... so it makes 0 sense that it is private. If it were public it would mirror the behavior of ofMesh::hasChanged, which would make the library more consistent.

c.