Milestone Qt GA

Port all key classes of the Qt toolkit. Some specific limitations (like printing) are still there, but most general purpose Qt applications should build.

Note: The GA will not be released until all tickets marked as blockers or critical are done. The completion of tasks with lower states depends on the time we will actually have and on the progress on blockers. If we are out of time, these tasks will be moved to the Enhanced milestone.

Note2: we hope to have all blockers done by the scheduled date.

Note3: the GA will also include Qt designer

Note4: Moved the due date because of more features wanted in the release.