Add ErrorID and warningID for all user-facing code

[ehennestad]

Fix #11

Motivation

Fix issue

How to test the behavior?

N/A

Checklist

• [x] Have you ensured the PR description clearly describes the problem and solutions?
• [x] Have you checked to ensure that there aren't other open or previously closed Pull Requests for the same change?
• [x] If this PR fixes an issue, is the first line of the PR description fix #XX where XX is the issue number?

[ehennestad]

Todo:

• [x] Go through all calls to the assert function.
• [x] Multiline error / warning calls negatively impacts coverage...

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 58.49057% with 22 lines in your changes missing coverage. Please review.

Project coverage is 90.80%. Comparing base (5aa27d9) to head (1b9cc75). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
+file/fillProps.m	0.00%	4 Missing :warning:
+file/Group.m	71.42%	2 Missing :warning:
+file/fillValidators.m	50.00%	2 Missing :warning:
+io/getBaseType.m	0.00%	2 Missing :warning:
+io/writeCompound.m	0.00%	2 Missing :warning:
+io/writeDataset.m	0.00%	2 Missing :warning:
+misc/str2validName.m	0.00%	2 Missing :warning:
+types/+util/checkDependent.m	0.00%	2 Missing :warning:
+file/fillConstructor.m	50.00%	1 Missing :warning:
+io/parseGroup.m	50.00%	1 Missing :warning:
... and 2 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #617 +/- ## ========================================== - Coverage 90.91% 90.80% -0.11% ========================================== Files 107 107 Lines 4753 4774 +21 ========================================== + Hits 4321 4335 +14 - Misses 432 439 +7 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.