Tendermint-in-Deku

[AngryStitch]

Depends

• [ ] #432
• [ ] #433
• [ ] #434
• [ ] #436

Problem

We need a new consensus in Deku.

Solution

Get Tendermint as defined in Algorithm 1, page 6 in Deku.

[d4hines]

We're leaning away from Tendermint and probalby towards HotStuff.