Update glutin to 0.30.0

The glutin 0.30.0 update decouples glutin from winit which
provides us with basis for a multithreaded renderer. This
also improves robustness of our configuration picking,
context creation, and surface handling.

As an example we're now able to start on systems without a vsync,
we don't try to build lots of contexts to check if some config works,
and so on.

That also brings us possibility to handle context losses, but that's
a future work.

Fixes #1268.

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