Create our own maven/dependency storage

[TeamDman]

https://discord.com/channels/313125603924639766/313125603924639766/1534826925392924792

Let's state this real quick:
Modmaven wasn't attacked.
But it did mirror things that shouldn't have been mirrored. My apologies for that. I will look into seeing if i can limit what gets mirrored.
The affected mirror has been taken out of the main repo for the time being, and soon all the caches will have updated too, and these artifacts will no longer be visible.
Thank you for bringing it to my attention.

SFM values reproducible builds. Hosting jars that SFM depends on, without polluting our git history, in a way that new actors can clone the SFM code and acquire the dependencies, would be nice.

Sometimes mavens go down and stuff as well.