0.1.0-beta-four

This release should fix:

• Random URTrator crashes on Linux and, possibly, Windows.
• Inability to launch game on Windows.
• Forgetting profiles for favorited servers. And remembering parameters of favorited servers in common.
• Clipboard watching for connect string. Tested as 100% working on Linux, but should also work on Windows and macOS.
• Copying server's credentials as connect string in clipboard is now possible. This includes password, if it was defined for favorited server.
• Crash if we failed to connect to master server.
• Ignoring system icons and use built-in ones. No more missing icons in toolbar or servers lists!

Known bugs:

• On linux no message dialogs will be shown, see in toolbar's action label instead, it can give some hints about what's wrong. Windows and macOS unaffected. See mattn/go-gtk#289 for details.