ScummVM and Emulationstation games launchers

[windg]

Let's remove lr-scummvm, problem solved. :p

[retropieuser555]

@windg I wouldn't say so, it's good to have the option if people want to play with shaders and overlays or to stream it on twitch or whatever other nice features Retroarch offers

[Lolonois]

@windg well, the ScummVM RP documentation is not aligned with the implementation. And it will create a clutter in the scummvm/ folder, plus will rewrite the *.svm files everytime after exiting ScummVM, which is surplus.

This and the missing interop with the LR variant made me to have a design which creates a more "it just works" experience for the user.