Implement cancelable WaitForSingleObject for Windows#575

Merged

njsmith merged 15 commits intopython-trio:masterfrom

almarklein:WaitForSingleObject

Aug 7, 2018

Commits on Jul 29, 2018

Commits on Aug 1, 2018

enhancements and tweaks to WaitForSingleObject
almarklein
committed

Commits on Aug 2, 2018

made WaitForSingleObject tests more trioish
almarklein
committed

Commits on Aug 3, 2018

Commits on Aug 5, 2018

added simple module docstring
almarklein
committed

Commits on Aug 6, 2018