XLib event loop canceling#16

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data-niklas wants to merge 4 commits intogolang-design:mainfrom

data-niklas:xlib_cancel

Commits on May 6, 2022

adds rudimentary test
data-niklas
committed

Commits on May 9, 2022

adds custom clientmessage to break event loop
data-niklas
committed

Commits on May 10, 2022