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@l3nz

NOTE: behaviour change. If a Dataset is made up of rows of maps, column_names now returns headers if it is supplied, otherwise returns
map keys from the first row. Previously, it just returned the map keys from the first row.
NOTE: PlotContent.get_svg_legend has been replaced with PlotContent.get_legend_scales. This moves the responsibility for legend
rendering to Plot, which allows multiple scales to be combined in future. This change was needed to allow plot content to
be resized based on the number of entries in the legend.
Change smoothed line to round coordinates to 2 decimal places (reducing SVG size for large plots).
Enable plot_options (show x axis, y axis) in LinePlot and PointPlot. Thanks @shadowRR
Added meta to Dataset to allow carrying of handy information with the dataset.
Added :legend_top and :legend_bottom options to :legend_settings - note that if you have too many legend entries it
may push the plot content beyond the bottom of the plot.
Added ContinuousLogScale. Thanks @l3nz
Added a gallery into the documentation. Thanks @l3nz
Added additional examples into the gallery provided by @travelmassive. Thanks @l3nz & @travelmassive
Fixes to tests & documentation. Thanks @kianmeng, @axelson
Fix to ContinuousLinearScale. Thanks @ruimfernanded

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