[FEATURE REQUEST] - Custom games entries.

[Cuphead74832]

What problem does the feature request solve?
An easier and more flexible way to use r2modman with other games

I would like a feature for using "custom games" by that i mean 3rd party not supported games. You would simply click "add" game when on the game selection screen and would be able to add a custom entry in the "custom entry section".

Once you start the r2modman there will be some limitations do for example the only mod you could install in the mods library would be BepInEx since the game is not supported in thunderstore it would just let you download the modloader for mod adding you would have to do it manually and trust me i have multiple games that are compatible with BepInEx but not with the thunderstore.

Also since the game is not supported by the thunderstore you would have to tell the exact .exe location or executable for linux users since the game wont be able to launch from steam directly. (if they add my feature a future expansion would be that you could set a command for linux users so for example the path is /path/game.exe but the game is a windows executable so with this option you could set a command to be used to launch the game so i place for example "wine" so when clicking start game it would execute "wine /path/game.exe" but i recommend the main feature idea is released before this one)

And by last since the game is again not supported you will not be able to use dependencies.

I hope this gets added for easier modding and i love the way you can manage profiles and so could also bring future entries to the oficial thunderstore supported games as they will be able to use the mod manager on unsupported games and so bring the opportunity to just make the first ever mods for that game and get it uploaded and supported in the oficial list by the thunderstore owners.