added option for detecting window close (pressing X button)#104

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mwindowshz wants to merge 5 commits intoDovyski:devfrom mwindowshz:patch-1

Commits on Nov 11, 2018

Update CHANGELOG to reflect the release of v2.7
Dovyski
authored

Commits on Aug 16, 2019

Add funding info
Dovyski
authored

Commits on Sep 30, 2019

Fix problem with trackbars in on-image demo

tamaUdon
authored and
Dovyski
committed

Commits on Apr 8, 2020

Make all widgets scalable (needed for High-DPI-displays)
h-b
authored

Commits on Dec 2, 2020

added option for detecting window close (pressing X button)
mwindowshz
authored