Implementation of xqueue/locks#17

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ochaton wants to merge 8 commits intomoonlibs:masterfrom

ktsstudio:locks

Commits on Dec 16, 2020

Commits on May 29, 2021

Commits on Jun 7, 2021

allow locks with delay
igorcoding
committed

Commits on Jul 16, 2021

use log.info instead of log.notice
igorcoding
committed

Commits on Jul 26, 2021