Candera Transitions

This version introduces a basic transition framework to Candera to allow activation and deactivation of nodes or scenes using configurable transition fragments based on a set of rules and a request. Currently only fading and switching is supported. For details on how to use the transition framework please refer to PID_app_dev_tutorial_11 on how to use the framework as well as the documentation of the Transitions::TransitionStrategy , which lies at the core of the framework.