openlcb / OpenLCB_Java / 481

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Collapse CDI panel segments by default (#182)

- Opens up the CDI panel with the segments all closed up.
- Fixes layout issues in CDIPanel when the window gets resized:
  - Removes horizontal scrollbar from the contentPanel.
  - Sets the width of the segment panels whenever the window size gets changed.
- Accessibility updates
  - Makes the CollapsibleHeader focusable to be part of the tab sequence
  - Adds keyboard listener for space/enter to expand the collapsed components.

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* Opens up the CDI panel with the segments all closed up.

* Fixes layout issues in CDIPanel when the window gets resized.
- Removes horizontal scrollbar from the contentPanel.
- Sets the width of the segment panels whenever the window size gets changed.

* Fix concurrency problem where we were modifying the layout of the
segment panels while the renderer thread was working.


* Makes the collapsible panel be operable via the keyboard. Adds them to the keyboard loop and
fills in the accessible context.

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