After poking around #7828, I saw the oppertunity for this cleanup,
which I think is both reasonable on its own, and quite low impact, and
removes the math around process start time.
I saw one of these tests fail and it looks like it was using code that
wasn't being called anywhere, so I deleted it, and avoided the package
name aliasing.
## Description
Internalize some libs. This reduces the amount ot public API tendermint is supporting. The moved libraries are mainly ones that are used within Tendermint-core.
