update scummvm core info

[spleen1981]

No description provided.

[hizzlekizzle]

look at all those file extensions simplified down to 1...

Can we sneak an updated description field in there while we're at it? Maybe something like:

description = "The ScummVM adventure game engine ported to libretro. This core is built directly from the upstream repo and is synced upon stable releases, though it is not supported upstream, so if you run into problems, please report them to libretro and/or make sure they occur in the standalone ScummVM program, as well, before making any reports to them.

[spleen1981]

Can we sneak an updated description field in there while we're at it? Maybe something like:

description = "The ScummVM adventure game engine ported to libretro. This core is built directly from the upstream repo and is synced upon stable releases, though it is not supported upstream, so if you run into problems, please report them to libretro and/or make sure they occur in the standalone ScummVM program, as well, before making any reports to them.

sounds good, added and squashed