Merge update v2.0.0 into master for release

For changelog see PR jely2002#42

Add shell script to AppImage to fix jely2002#26

Harden channel regex

Merge pull request jely2002#21 from jely2002/v1.8.5

Merge update v1.8.5 into master

Fix auto-update not working in 1.8.0 and 1.8.1

Fix missing point in README

Merge pull request jely2002#15 from jely2002/1.8.0

1.8.0 Merge additional fixes in 1.8.0

Add planned feature to README.md

Set version to 1.7.5

Merge pull request jely2002#11 from jely2002/1.7.2

v1.7.4