Better out of box smoothness and responsiveness (#357)

* Better out of box smoothness and responsiveness

This PR does various things to improve the out of the box editor
smoothness which includes:

* Adding new renwindow.get_refresh_rate method.
* Introduce new config.auto_fps flag to match the fps to current
  display refresh rate.
* Setting config.fps to match the display refresh rate by default.
* Emit displaychanged event to keep refresh rate updated.
* Allow smaller snap point on move_towards animation to reduce jittering.
* Reduce scroll rate from 0.3 to 0.2 for smoother scroll transition.
* Decrease garbage collection setpause to collect more often and
  in smaller sizes preventing big pauses, which should improve
  responsiveness.

Other Changes:

* Introduce new global DEFAULT_FPS to assist the settings gui when
  changing the config.auto_fps/fps flags.
* Revert default context lines from 10 to 1.
* Increase blink period from 0.8 seconds to 1.2 seconds which
  should be less distracting.
* Adjust run loop no-draw wait time
* Drop no longer necessary lower latency config
* Minor adjustment to code comment

Thanks to Amer for testing!

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