Graph Type on series picked with Group Selection (or listed in the new
`seriesIndexes` param) now sets the type of those series only, so a
column graph can carry a line series:
https://helpx.adobe.com/illustrator/desktop/automate-visualize-data/visualize-data/combine-different-graph-types.html
- Column, stacked column, line and area mix on the vertical value axis;
bar and stacked bar on the horizontal one. Scatter, pie and radar take
no other type. The help page doesn't list which types mix, so this is
our own choice: types that share the value axis.
- Stacked columns take one slot of the column cluster (a graph of
stacked columns only is unchanged); stacked series stack with each
other, areas with each other, and the value axis covers both totals.
- Areas draw at the back, lines in front of columns. Category labels,
areas and lines sit at the category centres once a series that isn't
edge to edge is in the graph.
- With only series selected, the Graph Type query returns their type,
so the dialog's OK keeps it, and they stay selected after the change.
An explicit `id`, or anything else in the selection, is the whole
graph, as before.
- A series given the graph's own type follows the graph again. A type
the graph's type can't take is drawn as the graph's and kept.
Series types are stored in a new `seriesKinds` field, written only when
a series has its own type; versions that don't know it draw the whole
graph as the graph's type. Graphs of one type draw the same art as
before.
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