Ipyvue-flatsurf

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**Fixed:**

* Fixed integration with sage-flatsurf 0.4.4

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**Fixed:**

* Upgrade vue-flatsurf to display disconnected surfaces.

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**Fixed:**

* Removed the limitation in the "paths" example notebook that intermediate connections cannot be mapped.
* Fixed a typo in a path construction in the paths example notebook.

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**Fixed:**

* Fixed caching issue when drawing paths in the same widget.

* Fixed a warning about the missing `FlowComponent::decomposition()` method.

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**Changed:**

* Cleaned up the implementation quite a bit. Mostly, by properly separating
different visualizations. They are all still available as `Widget` but this
then dispatches to the actual implementation classes.
Note that the old `FlatSurface` class is gone.
* Upgrade to vue-flatsurf 0.9.0 which brings lots of new features. However,
some features such as setting a glueing from the outside have not been
migrated yet.
* We now depend on ipyvue-async to make blocking asynchronous calls into the
Widget in Jupyter Notebooks.