- Specs have been added that represent phase and amplitude modes.
- 5 degrees with everyone order of phase and amp modes fields are now
  created by `createValidSim`
- `lvcnrcheck` looks for and validates phase and amp modes.

`Specs.valid` now return `Error` objects and the logic of generating
errors and associated messages have been refactor to their own dedicated
module.

Much error message logic has now been removed from `lvcnrcheck` with
only specific cases handled as nessesary, right now only a `Missing`
`Error` needs to be cased.