[Merge] lp:~gerboland/ubuntu-keyboard/remove-mir-papi-dependence into lp:ubuntu-keyboard

[Gerry Boland]

Gerry Boland has proposed merging lp:~gerboland/ubuntu-keyboard/remove-mir-papi-dependence into lp:ubuntu-keyboard with lp:~michael-sheldon/ubuntu-keyboard/fix-mir-deprecation as a prerequisite.

Commit message:
Remove all build-time mir dependence

>From 0.64, the ubuntumirclient QPA offers all the features required:
- explicitly allow us to request input method surface (using a shared magic number, unfortunately Qt doesn't have any way to request an InputMethod-type window)
- use QWindow::setMask to designate the input region

Then can remove MirInputRegionUpdater entirely as a result, and no need to depend on qtbase5-private and its friends.

Also made minor fix for scenegraph warning being printed at startup.

Requested reviews:
  Ubuntu Phablet Team (phablet-team)

For more details, see:
https://code.launchpad.net/~gerboland/ubuntu-keyboard/remove-mir-papi-dependence/+merge/318167

To test, you need 
https://code.launchpad.net/~gerboland/qtubuntu/better-input-method-support/+merge/318163
-- 
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~gerboland/ubuntu-keyboard/remove-mir-papi-dependence into lp:ubuntu-keyboard.
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