Add kml-support#72

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ThomasDaheim wants to merge 13 commits intoPiwigo:masterfrom

ThomasDaheim:master

Commits on Oct 27, 2015

Commits on Mar 28, 2016

Sync with "autocenter" update in xbgmsharp/master
ThomasDaheim
committed

Commits on Oct 23, 2019

Backport from master
ThomasDaheim
committed

Commits on Nov 20, 2021