This helps us to collect information about an app (title, ..) we can
reuse for certain other things like window construction.

Audio playback still has a delay about 1-2 seconds but it's usable.

This also moves the platform policy class into its own namespace to be
not specific to just window management.

We import all code here so we can customize and keep in sync with what
we do on the host side more easily.

This leads to much better performance and user interaction. Resizing
still has some flickering but that is a different area of problems.

Boot is too early for is now that we depend on some system services
like the ActivityManager one.