feat: ktor download + http only mode

[rushiiMachine]

• use Ktor instead of Android's DownloadManager (its so bad)
• add http only download mode
• add download progress flows (ui indicators will come later)
• [ ] wait for 6pak to remove permanent https redirect on aliucord.com

[rushiiMachine]

root bug was found no longer necessary

[Bluscream]

So much work for nothing :v

[rushiiMachine]

that's how it be sometimes I found a better solution