Open Controller 0.3.0

A Windows installer, and updates. open-controller-0.3.0-windows-x64-setup.exe installs for your
user without administrator rights, appears in the Start menu and in Apps, where it uninstalls, and
updates an existing installation in place (including one made with install.ps1), keeping your
settings. When a newer version is out, the window says so in a bar at the top: on Windows "Update
now" downloads the installer, checks it and runs it; on Linux and macOS it opens the download page.
The check asks GitHub once when the window opens and can be turned off in Settings. The zip stays
for running without installing. Settings from 0.2.0 carry over.