* [NOD-1098] Change timestamps to be millisecond precision
* [NOD-1098] Change lock times to use milliseconds
* [NOD-1098] Use milliseconds precision everywhere
* [NOD-1098] Implement type mstime.Time
* [NOD-1098] Fix block 100000 timestamp
* [NOD-1098] Change orphan child to be one millisecond delay after its parent
* [NOD-1098] Remove test that checks if header timestamps have the right precision, and instead add tests for mstime, and fix genesis for testnet and devnet
* [NOD-1098] Fix comment
* [NOD-1098] Fix comment
* [NOD-1098] Fix testnet genesis
* [NOD-1098] Rename UnixMilli->UnixMilliseconds
