Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the issue has not already been raised

Issue

From #3805, we can see that people want to pass options to find-my-way unhindered. We already have a couple options passed along in caseSensitive and ignoreTrailingSlash (possibly others). We should deprecate these top-level server options and require a routingOptions key that is a hash of find-my-way options.