Add ability to create a separate render thread locked to the display refresh rate

[foxnne]

This PR adds the ability to init our window's view with a CVDisplayLink that syncs a separate render thread with the display refresh rate. Window now has an on_tick, which when set, notifies the window creation method that the separate thread needs to be created and kicked off.

Currently most of the code that handles this uses the view's events directly by overriding defaults like viewDidMoveToWindow. I have started looking into how to move as much of this code to zig as possible, but currently none of it is used, and the objc code is responsible for the behavior.

This PR will need to be merged before the Mach companion PR is merged.

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