Replace and Update Datetime Parser

[lawrence-mbf]

Fixes #512

Motivation

To replace and update the datetime parser so it can be generalized following #512

How to test the behavior?

Reading and writing NWB files should be sufficient as they all need to update their file_create_date properties.

Checklist

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

[codecov]

Codecov Report

Merging #525 (db1a6d3) into master (601ee60) will decrease coverage by 0.24%.
The diff coverage is 84.86%.

@@            Coverage Diff             @@
##           master     #525      +/-   ##
==========================================
- Coverage   87.84%   87.61%   -0.24%     
==========================================
  Files         129      130       +1     
  Lines        5489     5537      +48     
==========================================
+ Hits         4822     4851      +29     
- Misses        667      686      +19     

Files Changed	Coverage Δ
+io/timestamp2datetime.m	68.96% <68.96%> (ø)
+types/+util/correctType.m	92.94% <92.94%> (+2.46%)	⬆️
+io/mapData2H5.m	97.77% <100.00%> (+0.15%)	⬆️
+tests/+unit/dataStubTest.m	98.43% <100.00%> (-0.07%)	⬇️
+tests/+util/verifyContainerEqual.m	100.00% <100.00%> (ø)
+types/+untyped/DataStub.m	95.59% <100.00%> (+0.44%)	⬆️

... and 1 file with indirect coverage changes

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