jpath regex timeout support added for a single regex expression, global umbrella for all regex calls, and support for allowing regex calls to get compiled if necessary

require users to set a global cancellation token themselves, to avoid a potential unmanaged memory leak, which cleans up the code a bunch and fixes the failing tests

fix tests so cached regex's don't cause one test to fail using prior tests timeout...

handle the global timeout of multitoken regex internally and test for it