[Feature] Add remote locations per-mod

[skwerlman]

Certain mods do not allow rehosting by modpack authors. (See JourneyMap for an example)

Having the ability to link to solder-formatted zips outside of the normal repo would be extremely helpful in these cases, since it's much easier than the current method, which is to add a special case in your nginx config for each such mod.

[bochen415]

relevant: https://github.com/bochen415/JourneyMap-TechnicSolder-Tutorial/wiki

[GenPage]

#206

[Sunconure11]

Support.

[SConaway]

Support

[Arzte]

Before this goes too far please use githubs :+1: emoji to vote the image on the first comment rather than spamming the issue with "support" comments.

[Pulz-TCP]

I'd love to see support for this- once they get someone to help with the launcher!

[Pyker]

Definitely something we'll implement. Just have to figure out how first. There's some partial support for custom URLs in the current version of Solder (0.7.6), but it isn't in a usable state at all.