Rework MenuBar. Add MenuButton. Add mouse event cascading to floaters. LinearLayout: spacing now applies to all children, not just those with expand. Fix Window resize request inside layouts. UnicodeGraphics: prepare for styling/theming.

Emitter
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.. toctree::
   :maxdepth: 3
   :titlesonly:

   widget

.. autoclass:: tuikit.events.Emitter
   :members:
   :show-inheritance: