Were you thinking of the Hardtime plugin?Which-key is great, btw. I think I learn a new shortcut or something every day using it.
https://github.com/MrTuxx/OffensiveGolangHere's a collection you can check out. I recommend Ben Kurtz's Defcon talk he links to as well.
My guess is the cathedral that was started ca 1070. Other than that the oldest wooden buildings are from the 1700s.
Arch Linux and the tests are on the same page as the other one in the group chat with the team and the tests expect https
As for music production on Linux, I use Reaper. Check it out and see if it meets your needs.