Receives touchspot events out of the input stack and manages appearance of touchspot renderables for visualization. Touchspot visualization is disabled by default and must be enabled through a call to ::enable
System options. Interface for extracting configuration options from wherever they may be (e.g. program arguments, config files or environment variables)
An observer for top level notifications of scene changes. In order to receive more granular change notifications a user may install mir::scene::SurfaceObserver in surface_added