✨ Feature request - .sav save file support

[Rikj000]

Stand alone mGBA saves game progression as .sav files.
For some reason the libretro core for mGBA, saves these same files as .srm files,
which out-of-the-box are not compatible with each-other but can allegedly be converted.

This is an unnecessary conversion step which should not exist in the first place,
which makes it basically impossible to synchronize saves between devices, through things like Syncthing.

Imho RetroArch should not dictate to other emulators in which format they should save their files,
instead RetroArch should at least support the original save file formats alongside custom RetroArch only formats.

Linked mGBA Issue

mgba-emu#2144

[endrift]

They're exactly the same except for the extension.