[processing] add "Save as" functionality to History dialog (fix #10086)
[processing] use checkbox for boolean parameters
Fix heatmap failing for multipoint tables, fix incorrect calculation
of heatmap input layer.
Clean up and modernise heatmap dialog using QgsMapLayerComboBox
and QgsFieldComboBox.
Add option for unscaled values for heatmaps rasters, set as default
Add tooltips for form/table switcher buttons in attribute dialog
Editor widgets: Show NULL value on numeric line edit
Improved method for selecting random colors for categorised renderer,
which should result in more visually distinct color choices
Allow copying selected palette colors in color picker dialog
add support for NULL values in range widget (new Qgs(Double)SpinBox classes to show the clear button)