application: Expose grilo as an application property

Do not instanciate Grilo object in its own file. Grilo should be
initialized as soon as possible because Window and Views need to know
at startup if the tracker plugin is available. So, moving it to
Application makes sense.

Move Grilo to Application, and make it a property so that it can be
accessed as application.props.player. It is a readable property, since
there is no reason to change it.
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