UtAssert_StringBufCompare output of strings could be put on top of each other for easier problem identification

[asgibson]

Is your feature request related to a problem? Please describe.
Differences in strings can be hard to identify when they are side by side. Current output:

[ FAIL] 02.003 tests.c:38 - String: 'Space Error?   ?    ?      ?       ?' == 'Space Error?   ?    ?       ?       ?'

Describe the solution you'd like
Stack strings for easier identification of malformations. For example:

[ FAIL] 02.004 tests.c:40 - String:
Received:'Space Error?   ?    ?      ?       ?'
Expected:'Space Error?   ?    ?       ?       ?'

Describe alternatives you've considered
Manual copy and paste into text editor.

Additional context
N/A

Requester Info
Alan Gibson NASA/GSFC 587