Additional array test functionality and RegEx Matching

[connerk]

ToBeIn() ToNotBeIn() (Syntactic Sugar.)
works inverse of ToContain() and ToNotContain(), checking if a value is (not) in an array instead of if an array contains a value.

Contains()
Now capable of accepting multi dimensional arrays arrays
Now capable of accepting arrays for both Actual and Expected arguments. i.e. see if all items in an array are found within another array.

ToMatchRegEx()
allows for Regular Expression matching

Expect() (CreateFailureMessage())
can now have fail message overridden with a more descriptive string

[timhall]

I wasn't able to merge this directly, but I included your Contains changes as .Includes Values, Value and Expect() as .Fail("Message") in #23. I will revisit the RegEx proposal later as I would really like to have it, but I want to maintain Mac compatibility with VBA-TDD/vba-test. It will most like start out behind a feature flag like #Const EnableIsMatch, but I need to think about the API more.

Thanks for the contribution!