[issue19842] selectors: refactor BaseSelector implementation

[Charles-François Natali]

Charles-François Natali added the comment:

> Guido van Rossum added the comment:
>
> LGTM, although I wish that you had time to implement the comment "TODO: Subclasses can probably optimize this even further" rather than just shuffling the existing code around. :-)

I will look a this, but I rather take care of the API than
implementation details :-)
Also, I'm not sure that modify() is actually a performance-critical
code-path: do you have any semi-realistic asyncio-based benchmark I
could use?

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