fix: make pathfinder composer 2.x compliant

[warlof]

extract mixed class into dedicated file and address filename typo in order to make the project PSR-4 compliant and work with Composer 2

[deMathias]

looks good to me. Tried and no more errors.

[samoneilll]

Thanks, this should solve issues a lot of people have had with using composer 2.x, I've merged it into our fork at https://github.com/goryn-clade/pathfinder

[Xyncgas]

we need to merge this so new people coming from hearing about pathfinder don't get stuck running composer install

[samoneilll]

@Xyncgas this particular version of pathfinder is no longer maintained and won't work due to the very out of date Oauth implementation. It has been merged into the active fork at https://github.com/goryn-clade/pathfinder

[Xyncgas]

Can we bring https://github.com/goryn-clade/pathfinder to merge with this repository because this helps a lot people

[samoneilll]

We cannot because the maintainer of this repo has abandoned it.