The mainItem is now a Component, which gets created on demand and passed
to the tooltip dialog.
Positioning is a bit off now, but it basically seems to work as we'd
like it to.
This implementation deviates a bit from the Plasma 1 tooltips:
- image is now a string
- tooltips align to the parent by default, or the visualParent set
Otherwise, the changes should be fairly transparant.
A crude basic featureset works.
ToolTipProxy is now a QQuickWindow and renamed to ToolTipWindow.
This is done in C++.
ToolTip itself is a QML file, which internally uses tooltipwindow to
display the attached item.
Basic showing / hiding and embedding an Item works, positioning,
margins, etc are not implemented yet. Neither are special windowmanager
hints and flags.
All cpp code moves into the src/ subdirectory, as the Frameworks policy
suggests.
Directory structure should now be in line with other, future frameworks.
