Limit the frame rate when minimized #1
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This avoids high CPU usage when minimized.
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Fixes: bdunderscore#8
When the application is minimized rendering is skipped and doesn't limit the
RunLoopfrequency. This causes unnecessarily high CPU usage.This PR fixes the issue by sleeping the thread as needed to limit it to 60 FPS similar to when it isn't minimized. This should be fast enough to not impact continuous calibration as
CalibrationTickonly actually runs every 50ms.