adds support for removing wrapping exceptions

[jscottnz]

This PR adds support for removing generic exceptions that are wrapping interesting exceptions like ServletException wrapping a NullPointerException

This PR also moves as much filtering code from the webprovider to core as possible.

RaygunClient.initialize(new DefaultRaygunServletClientFactory("kxiM7MSMbrTVvuYNSGklbw==", servletContext)
     .withRequestCookieFilters("JSESSIONID")
     .withWrappedExceptionStripping(NestedServletException.class, AnotherWrapper.class)
);