Escape backslashes in parameter strings.

[skieffer]

Fixes #139

I added the functional test tests.functional.test_all.TestStringMethods.test_properties_with_escapes() which demonstrates that, when you set a property string containing backslash or quotation mark, you get the same string back after reading.

I also rewrote the unit test tests.unit.test_util.TestUtils.test_quote_string() using raw strings, which I think makes the test much easier to read and understand.

[sonarqubecloud]

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[swilly22]

Thank you @skieffer,
Out of curiosity what are you using RedisGraph for?

[skieffer]

Out of curiosity what are you using RedisGraph for?

It's a back end for an app that lets multiple authors share components that will be linked together -- hence the need for a graph database.

I recently added a step that stores document snippets as properties in the graph, and these snippets often have their own escaped characters within them -- including \" -- so I stumbled onto this issue.