Allow two decimal places for Opacity

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In the block editor the Opacity setting doesn't allow numbers with two decimal places. The shortcode does.

See https://s.b/oikcom/block_example/chart-block-multiple-y-axis-scales/
where the opacity is set to 0.35 in the shortcode but can only be specified as 0.3 in the block editor.
As soon as you type 0.35 it gets trimmed to 0.3.

Requirement

• Allow Opacity setting to be specified to 2 decimal places

Also. Check how Gutenberg range controls are supposed to appear.

The slider part is missing.

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The probem with the sliders not appearing was due to them being enclosed in <PanelRow> containers.
Having removed these, and the redundant <PanelBody> containers the slider tracks appeared correctly.

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Delivered in v1.2.0