Changes since v3.1.1

• Fix crash when the connection is closed by the server.
• Fix CRITICAL log messages that make reference to a NULL pointer cast.
• Linux: Ungrab the keyboard and mouse after 50 seconds of inactivity so that the screen saver and lock screen apps can run.
• Windows: Fix installing to “C:\Program files” on 64-bit OS.
• Windows: Fix showing model and vendor of known USB devices.