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.
4 jobs for wip/jfelder/expose-grilo-application-wide in 9 minutes and 21 seconds (queued for 1 second)
Status Job ID Name Coverage
  Check
passed #293529
flake8

00:02:29

 
  Build Flatpak
passed #293530
flatpak

00:06:28

 
  Deploy
passed #293531
review

00:00:23

failed #293532
allowed to fail manual
stop_review

 
Name Stage Failure
failed
stop_review Deploy There has been a missing dependency failure
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