[Bug] Fix query splitting with quoted semicolons

[Michael-S]

Description

The Query Workbench would terminate queries with semicolons, even if the semicolons were inside quoted strings.
For example, select * from x where y = '1;2' would POST to the server select * from x where y = '1.

This change makes the query parsing a bit more sophisticated, and attempts to handle quoting properly.

Issues Resolved

#243

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented. (Not Applicable)
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

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