Automatically update GE-Proton and set Steam to use the latest version

[Jpxe]

Is your feature request related to a problem? Please describe.
I want the latest GE-Proton. I want it to auto update and it would be great if I didn't have to change it in Steam every time there is a new version.

Describe the solution you'd like

1. Set once in Steam: Change compatibilitytool.vdf and set the internal name to GE-Proton-Latest.
2. Auto update: Auto update function added to ProtonUp-Qt. Either command line -autoupdate and/or checkbox in GUI. Run every day automatically.
3. Auto remove old version: Automatically delete old versions. (optional checkbox)

Describe alternatives you've considered

Some potential other ways to achieve the same thing:

4. Custom folder: Make a custom folder called GE-Proton-Latest in <steamfolder>/compatibilitytools.d/, make a custom compatibilitytool.vdf in there and set to latest version.
5. Symlink: Same as above but use a symlink.
6. Update config.vdf: Don't change the internal name, update every instance of GE-Proton CompatToolMapping in config.vdf to latest.

[DavidoTek]

Thanks for the suggestion, we are already aware of this possible enhancement.

There are a few issues discussion this topic: #117 #162 #286