In some cases, a route can be requested while a sink is cooling down.
In those cases, the routing logic should keep track of requests for a
destination and wait until cooling is complete to request the new
route.
Major update to remove eRoutingSignalType.AudioVideo in favor of bitmasked values and adding UsbOutput and UsbInput types. Updated all affected routing ports and ExecuteSwitch method calls.
Need to review and test routing to ensure bitwise operators are all correct.
