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Kaby Lake modesetting support
This PR is a massive dump of code to get modesetting working on Kaby Lake. eDP and HDMI output are supported, and support for regular DisplayPort should work but is untested so far.
For now, the default is to limit the outputs to a single one (the first one that is successfully pre-enabled). This should improve in a future PR in order to avoid blowing this PR up even more and to get this upstreamed after ~2 years of work.
Most code that is used for Kaby Lake support has been converted to C++, and a few utilities have been added to aid with debugging.