Move T3_Framework_MVC_URI to a more fitting subpackage
The T3_Framework_MVC_URI represents a URI and is not bound to the MVC framework. It better fits where other data types are located - e.g. in the Property subpackage.
- FLOW3: (MVC) Specifying an unknown controller in the request URI resulted in exception 1187176358 which was misleading. Changed that so that the Default Controller is used instead. Needs some proper not-found-handling in the future. * FLOW3: (MVC) Moved the URI class to the Property module. Resolves #75.