update checker for launcher?

[unitycoder]

Could be nice to have.. now have to go github, download, unzip manually..

• button to check for updates (and/or check at start)
• then later should have the app published with installer, so that can just install over the old version

[unitycoder]

this is working now in the latest commit,
using this method to check updates:
https://stackoverflow.com/questions/48838051/how-to-compare-application-version-to-its-github-releases