remove duplicate withOutOpacity method from seriesColours

Get x/y range from plot-area "measure" event
Use a generic approach (similar to mainAxis) for getting closest point
Added option to existing tooltip component to allow for always-show
Added tooltips for canvas scatter chart

Refactored tooltips into cartesian-chart component

New approach to setting xAxis/yAxis lead to a slightly different method for styling the axis too.

The d3fc chart replaces the axis `decorate` function with its own `xDecorate` function, so we need to set that directly.

Updated d3fc and replaced local cartesianSvgChart

* Removed old SVG X/Y chart and replace with the Canvas one

* Remove old pointSeries

Replaced use of Array.flat
"Fixed" `withoutOpacity` function so that it uses "rgb()" instead of "rgba()"
Added workaround for weird Edge issue that doesn't render the plot-area of some charts (bar/column charts and heatmap) unless you resize the window. An immediate redraw of the D3 element seems to work, but is not great.

Add tooltips for Area charts

replace colour references with color

It turns out we don't actually need to use copies of the scales, and therefore can avoid decorating the chart object to get the "measure" (though this approach does require calling the "toolTip" component after the chart has been rendered. This allows us to simplify the code quite a lot.
Also:
* rebind `settings` and other properties from base tooltip component
* added `size` option for controlling highlight sizing (though the "range" has to be modified because the symbol size behaviour isn't the same as the circle radius behaviour)
* Use nearby-tooltip for the y-scatter chart, since it's a better experience

Improved and simplified nearby-tooltip code and used on y-scatter

Tooltip fixes

Added candlestick chart

…rom those

Updated d3fc and used its new ordinalAxis

basic OHLC / candlestick charts

remove unnecessary slice