Scaling issues

[CrazyFlasher]

Sample on the site resizes fine:
https://heaps.io/samples/base2D/

However if I build from source, I get weird results:

[CrazyFlasher]

for some reason, onResize is not called.
I've debugged sample here https://heaps.io/samples/base2D/ and onResize executes during stage resize

[CrazyFlasher]

I guess I found a commit "Remove useless listener and timer" db3ddc3 :)

Looks like timer did the trick

[CrazyFlasher]

#987

[Nicolas Cannasse]

ping @trethaller

[trethaller]

IIRC we mostly had issues with the Timer, not so much the resize callback, so I've merged you PR and will see if anything breaks on our end