RFC: Package based additions

Basically dividing up the current system to the normal system and a new package based system.

Pros:
Allows modular modpack building
Fixes the issue of sorting mods in the current system
Allow picking sets of mods individually

Cons:
Divides up the modpack in infinite configurations
Not the original intention of the program

Ex:
`"packages": [ {"name": telsa", "mods":[], "conf":""}]`
