Track and store the location and size of player with live preview

Live preview of DS is always opening with same settings. What we should do is to track the live preview window about screen positioning and size and store those as they change. This would mean that next time person plays "live preview" it opens up in the same position it was left.

Saving the position at close does not work because puppet can also crash.

Saving of the position and coordinates should be saved to qmlproject file so they are not part of the Constants.qml and thus present only in Live Preview.