Rename "quorum" in governance to "threshold"

[Chris-Hibbert]

What is the Problem Being Solved?

Governance enforces rules about minimum number of voters to pass, but calls it "quorum". Quorum actually refers to the number of voters who must be present (or in our case participating.)

Description of the Design

Change the wording to "threshold" or something else that makes sense. While touching this add support for 2/3 or other super-majorities.

Security Considerations

None

Test Plan

The usual.

[turadg]

@Chris-Hibbert should this get in for MN-1? It's in the backlog and has no scheduled release.

[Chris-Hibbert]

MN-1 would be good.