resloveMetaData() only matched Q_CLASSINFO against the first segment of
the property path (e.g. "ptPosition" from "ptPosition.x"), so child
handles like x/y under a QPointF tree never picked up Min/Max/Step
metadata declared with Q_CLASSINFO("x", ...). This caused the x/y
NumberBox editors to fall back to numeric_limits min/max, clamping
negative values to ~0.
Now iterates path segments from most specific (last) to least specific
(first), so child property names correctly match their Q_CLASSINFO
annotations.
Also add Q_CLASSINFO("x"/"y", "Min=-1000,Max=1000,Step=1") on
GraphicsTextItem to constrain position editing to a reasonable range.
Extract a pure virtual IShape interface from AbstractShapeType<T> so
selectors and Document use dynamic_cast<IShape *> instead of
qgraphicsitem_cast<AbstractShape *>. This decouples the selector
system from the template hierarchy, enabling GraphicsTextItem (backed
by QGraphicsTextItem) to work uniformly with all existing selectors.
GraphicsTextItem supports inline text editing (double-click to edit,
focus-out to finish), font/color properties via PropertyEditor, resize
with proportional font scaling, move, rotate, and full serialization.
Adds CM_place creation mode for single-click placement.
jessequ