Load mods from `.mcmod` files

[Adrian8115]

It would be awesome if we could load mods from simple .mcmod files that when double clicked open the launcher and provide an ui to select a profile that the given mod should be added to (including copying it to the mods folder/providing a custom installation directory for it like mentioned in this pr https://github.com/FrederoxDev/Amethyst-Launcher/pull/9)

(.mcmod is not the final extension, we should still discuss it)

[outercloudstudio]

What about an extension like .amethyst?

[FrederoxDev]

I like .amethyst