(#17) updated TargetFramework to net6.0-windows7.0#18

nils-a wants to merge 2 commits intogitextensions:mastergitextensions/gitextensions.plugintemplate:masterfrom

nils-a-forks:bugfix/GH-17nils-a-forks/gitextensions.plugintemplate:bugfix/GH-17Copy head branch name to clipboard