Add modpack support.

[meelock]

Is your feature request related to a problem? Please describe. There is currently a lack of support for modpacks, meaning that they often require a fair bit of work to update, which may be an issue for newer players.

Describe the solution you'd like Add modpack support, allowing for easy installation of Kennen's modpack, Goat's modpack, and Mombun's modpack. Essentially, all it does is lets you click a button that downloads the pack, and then copies the mods from the mods folder in the individual repos into the mods folder of the currently selected game, overwriting any duplicate files.

Describe alternatives you've considered Adding some sort of indicator that modpacks and external tilesets exist. Or just not, it might be a bit too much work.

Additional context NA

[ZhilkinSerg]

Launcher already supports installation of multiple mods in one click. Create a modpack and create a PR with modpack download link. The code for a modpack would be basically the same as for a single mod with a single exception - it would contain multiple mod identifiers in ident node. See example below:

https://github.com/remyroy/CDDA-Game-Launcher/blob/3eb95c9149f349fc600a69bc2a2152a6bc4843e3/data/mods.json#L279-L289

Launcher does not currently support tilesets. It is a planned feature though - https://github.com/remyroy/CDDA-Game-Launcher#planned-features