gevent / gevent / 2412

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Try to adhere to scheduling deadlines when running callbacks

This should result in the loop getting serviced more often when there
are many callbacks to run. This is hooked up to `getswitchinterval` to
allow control.

We check the interval every 50 callbacks. That's hardcoded, which I
don't like, but the 1000 callback number was hardcoded before, so it's
not really much of a change. A future extension would be to calculate
the check number dynamically based on dividing the switch interval.

I don't have a specific test case for this change because I'm a little
fried, but all the other tests pass. I did manually verify that the
example in #1071 matches expectations---that could probably be turned
into a test case with some work.

Fixes #1072
Fixes #1071
Fixes #1068

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