Move some setup methods to Player construction

[ferjm]

Right now we have a set of methods to setup various aspects of the Player that could be easily set during construction. In particular:

• register_event_handler
• register_frame_renderer
• disable_video

[ceyusa]

• register_event_handler
• register_frame_renderer

With the current design is not feasible to set these parameters at construction since the user can register several event handles and frame renderers.

[ferjm]

Yeah. IIRC we are currently calling these methods only once in Servo.

A consumer that wants to handle events in multiple places can always use its own internal mechanism to proxy the events coming through the registered servo-media event handler. Also I don't see the point of having multiple frame renderers. In any case, we could still have these API methods even if we extend the constructor to get an event handler and a frame renderer.

I have an old patch doing this. I'll rebase and open a PR.