Add dwproton from dawn-winery team useful for many anime/gacha games

[bayazidbh]

Is your feature request related to a problem? Please describe.
The dwproton is a downstream of Proton-CachyOS which adds patches primarily meant to help run various anime/gacha games (most notably recently: Arknights Endfield).

Describe the solution you'd like
Add support for dwproton in protonup-qt.

Describe alternatives you've considered
I can manually install it, or use ProtonPlus I suppose.

Additional context
https://dawn.wine/dawn-winery/dwproton

Edit: I just saw #599 my bad. That PR should close this issue when done then.

[samuelznewton]

Changelogs suggest this feature was added in v2.15.0, but I don't see dwproton as an option (checked in both 2.15.0 and 2.15.1). Am I missing something, or perhaps wiring up the menu slipped someone's mind? 😅

[seeeeew]

For me it has definitely been available since v2.15.0. Here's a screenshot from the current version:

[seeeeew]

I just noticed I can only see dwproton in the Flatpak version, but not in the AppImage version, and it's not the only compatibility tool that's missing. I'll create a new issue and link it here. I've created #630 for this.