Automatically detect configuration changes and reload. On systems which
provide notification mechanisms, use those, otherwise fallback to
polling. When a system configuration change is detected, it
asynchronously applies the configuration in order to ensure it is a
non-blocking operation for any queries which may still be being
processed.
On Windows, however, changes aren't detected if a user manually
sets/changes the DNS servers on an interface, it doesn't appear there is
any mechanism capable of this. We are relying on
`NotifyIpInterfaceChange()` for notifications.
Fixes Issue: #613
Fix By: Brad House (@bradh352)
Brad House