[Linux Only] Add "gamemode" support.

[stuck perch]

Add a simple toggle that makes the game run using Feral's Gamemode.

[bright mortar]

i think thats also not on windows

oh

i think not possible cuz that means lc needss a seperate aapp for linux

and if devs have a bug if they fix the windows version there can be chances that the linux version needs extra time to fix cuz of the feature

[stuck perch]

yeah, gamemode is a little "app" that you can dowload on linux

only runs when you tell it to run, it helps with performance a little bit