add high DPI support to declarative games

Review Request #122869 - Created March 9, 2015 and submitted - Latest diff uploaded

Information
David Edmundson
libkdegames
Reviewers
Kdegames

Made everything needed for KNetwalk to work with QT_DEVICE_PIXEL_RATIO=2

Ran KNetwalk with QT_DEVICE_PIXEL_RATIO=2 everything was super smooth.

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