**This commit**
This commit provides the following new features for dual list multiselect:
- The "available" pane, which has all of the entries that are available to be selected. Items that
are already selected will remain, but they're marked with a checkmark and can neither be selected
or moved.
- The "selected" pane, which has *all* of the entries that have been selected.
- The Pagination control, which in this case only sends an event upstream.
**Plan**:
The plan is to have a master control that marries the available-pane, selected-pane,
select-controls, and pagination-controls into a single component that receives the list of
"currently visible" available entries and keeps the list of "currently selected" entries, as well as
a pass-through for the pagination value that allows it to hide the pagination control if there is
only one page.
A master component *above that* will provide the list of currently visible entries and, at need,
read the value of the master control object for the "selected" list. That component will mostly be
data-only; it's render will probably just be `<slot></slot>`; its duty will be only to map entries
to string keys Lit can use, and to provide the lists we want to provide and the pagination ranges we
want to show.
Some judicious use of grid will allow me size the controls properly with/without the pagination
control.
Status and Title are going to be in the master control.
A <slot> will be provided for Search, but I have no plans to integrate that into this control as of
yet.
There is already a planned fallback control; the multi-select experience on mobile is actually
excellent, and we should exploit that appropriately.
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