Fix Table Recognition So It Does Not Match Table Rows with Just Dashes in Them

[pjkaufman]

Fixes #1235

There was an issue reported around tables getting messed up if some of the rows were filled with hyphens/dashes. This was caused by looking for the separator row and not checking that two lines prior was not also a part of the table. So I added that check to see if the line two lines prior either started or ended with |. If it does, then we know that it is a table row and we will skip this as a table addition. This seems to allow the table recognition logic to work for this scenario.

Changes Made:

• Added UTs for the table recognition and the adding of blank lines around the table
• Updated the table recognition code to check two lines prior to the potential separator line to see if it is a part of the table as well and skip that potential separator if it is a part of the table