Add separate drawstyles options to Qt figureoptions dialog #4589
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This fixes #4447 where it was reported that it is impossible to
undo a step drawstyle using the Qt figureoptions dialog. The step
draw style was applied as a linestyle (which is permitted in the
API) but undo 'default' option was not included in the list.
However adding the 'default' to the linestyles would mean enabling
step and changing the linstyle would require the dialog to be
reopened. Here instead a separate option set is created for
draw style (and Style is renamed to Line Style).
There is also a change of indentation for the line:
which was not indented into the correct block. This
caused an error on any figures without visible lines.