feat: make linux setup script take args for various automation projects

[xXJSONDeruloXx]

Adding the ability to pass in some args to the linux_setup.sh script to better facilitate various projects that attempt to automate OptiScaler installation (Decky Framegen, Goverlay, ProtonPlus etc).

Currently, each program needs its own logic or bespoke installation and removal scripting, but if this is built into the upstream script, then these programs can just worry about getting all the opti files into the correct dir in the game, then run something like:

./setup_linux.sh --filename=dxgi.dll --overwrite=y --using_nvidia=n --using_dlss=y

Which greatly simplifies Opti integration in a variety of linux tools.

[FakeMichau]

A bit crude but if it works for you then that's fine.
But I would like to ask for two things:

• An option to use -h and --help that would explain those parameters and how to use them
• Way to skip the "Press Enter to exit" at the end to make the script automatically exit when used with those arguments

[xXJSONDeruloXx]

@FakeMichau good catch with the Enter press skip. Added a help arg and skip "Press Enter to exit" if any args passed.

If you feel the current approach overall is a bit clunky though, I am open to alternatives.

[FakeMichau]

Could you add the help and enter skip to the uninstaller as well?

[xXJSONDeruloXx]

@FakeMichau done

[FakeMichau]

Will need to be picked up by the v0.9 branch at some point