0.5.2

AdgADim, a new entity to quote angular dimensions, has been implemented.

The linear dimensions now accept the "outside" property to reflect the
arrows in reference to the extension lines. By default, the value of
this property is undefined and will be computed runtime depending on
the quote size and the available space.

The new AdgEdges model can now be used to programmatically build a serie
of vertical lines expressing the edges of another model. This can be
used on symmetrical shape, often met in turned parts.

The entities now actively responds to extents requests, so it is possible
to get the needed space before rendering them. Any matrix change now
emits specific signals to fulfill this requirement.
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