v1.5.9 - ModPacks

Description

Unofficial update for friends to use the ModPack feature of this launcher that I made (pending PR in the actual repo).

To export/import modpacks navigate to your "Installations" within the launcher and clicker the "edit" button (spanner) and there will be two buttons at the top. They are expecting JSON manifests that look something like:

{
   "name":"My Modpack",
   "gameVersion":"1.22.1",
   "mods":[
      {
         "modid":"betterruins",
         "version":"2.0.4"
      },
      {
         "modid":"carryon",
         "version":"1.0.5"
      }
   ]
}