circle, tests: general debugging and minor improvements

circle: remove testify and collapse unit tests

Separate integration tests from unit tests by tag, and fix remaining RPC tests

version: correct develop to v0.12.0-rc3

Use a random subscription id as rpc/v0 does on rpc/tendermint

testing: hard-cut on making the CI green

Fix mapAndValues and even write some, like, test

Dry up client

[Merge last] Fix NameReg test

Tweak BlockchainInfo to use stuff we have actually initialised

Don't special case empty blocks when refreshing the checkCache on commit

Stop tests from panicking

CheckTx is run

Combine consensus and manager events into a pool of types we control

Remove redundant v0 gateway from tendermint tests