Add launch option to make skse-loader silent (for Steam Deck users)

[Star-X555]

Right now SKSE loader outputs its logs in a terminal. On a normal desktop PC this is fine, but on Steam Deck it could be an issue. While Valve fixed the bug that made Skyrim unplayable from this, I believe it causes sound issues when activating sleep mode, which isn't fixed by the pause plugin from Decky due to there being two windows instead of one.

Easiest solution I feel is to add a command line argument that toggles the console output so that the game just launches without a window filled with debug info. That way it's there by default, but users playing on Steam Deck can toggle the debug output if they wish.

[ianpatt]

Many processes write to stdout. This needs to be fixed on the Proton side.