Adds the option when configuring a legend item to place a column
break before the item, causing it to be placed into a new column
This allows user control over the column content, for cases when
the automatic column generation doesn't result in the desired results
This allows users to (optionally!) customise the symbol appearance
for a legend node, e.g. to tweak the colors or symbol sizes to better
provide a "representative" patch symbol compared with how those
corresponding features actually appear on the map.
It's useful for exaggerating symbol widths, or for manually tweaking
the colors of semi-transparent symbols so that the colors represent
the actual appearance of the symbols when rendered on top of the map
content. Or to tweak the marker interval/offset in marker lines so that the
markers are nicely spaced in the legend patch.
Fixes#14077
Allows users to override the symbol patch size for individual legend
nodes, by double clicking the node
Width and height can be individually overridden, with the node falling
back to the default width or height when the override isn't set.
Sponsored by SLYR
