Add support for CSS cursor images

[adamjs]

Within CSS, it is possible to define cursors with custom images. For example

cursor: url('path-to-image.png'), auto;	

We should extend ViewListener::OnChangeCursor to support custom cursor images as well.

[m4heshd]

cursor: pointer; also doesn't seem to work at the moment.

[gaetandezeiraud]

@m4heshd Same problem for cursor: pointer; :(

[ThomasFrans]

cursor: pointer; still seems to be broken...

[Steven-L-42]

still a problem.. please add this ability to change or set cursor to none.