[Feature request] Allow updating/downloading multiple modpacks simultaneously (+ while playing)

[Novocastrian]

Is your feature request related to a problem? Please describe. Would like to update/download multiple modpacks simultaneously (match curseforge client capability) Describe the solution you'd like Capability to download/update modpacks simultaneously. Bonus points if we can do that while playing. Describe alternatives you've considered None possible, as the client disables navigation while it (painstakingly slowly) downloads the update/installation files