sebastian/threema-web: Threema-web, clone of the official github repo from 12.2020

Danilo Bargen 77c50b7ffb Use document focus instead of page visibility API (#644)		%!s(int64=6) %!d(string=hai) anos
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LICENSE	14330b70fa Vendorize angular-inview	%!s(int64=8) %!d(string=hai) anos
README.md	14330b70fa Vendorize angular-inview	%!s(int64=8) %!d(string=hai) anos
angular-inview.js	77c50b7ffb Use document focus instead of page visibility API (#644)	%!s(int64=6) %!d(string=hai) anos

angular-inview library with pull request 122 applied (commit e7c57e0314)