parse launch args to auto launch bdm games

[KrahJohlito]

Pull Request checklist

Note: these are not necessarily requirements

• I reformatted the code with clang-format
• I checked to make sure my submission worked
• I am the author of submission or have permission from the original author
• Requires update of the PS2SDK or other dependencies
• Others (please specify below)

Pull Request description

This will allow auto launching BDM games by sending a few args:

 argv[1] file name (including extension)
 argv[2] game->startup
 argv[3] game->media ("CD" / "DVD")
 argv[4] “bdm”

I could only test the USB side of BDM since I don’t have an iLink drive or an MX4SIO but in theory they should also work fine… not sure if I should squash commits either.

[uyjulian]

Quick glance, lgtm

[KrahJohlito]

Gotta push a 2 line update after work.. forgot to remove unused variable in the clean up

[KrahJohlito]

Alright that’s defo done