feat: SupplementaryInfo supports inherit colour

[kurtdoherty]

This PR

• Adds new colour prop to SupplementaryInfo that supports all the same colours as SupplementaryInfo.Item. This prop allows the colour of all items to be set, while still permitting individual items to be uniquely coloured via their own colour prop.
• Adds a new inherit colour value that causes the parent's colour to be inherited. This is useful when the supplementary info is being displayed in a parent that wants to control the default colour of items.
• Makes inherit the new default for both the SupplementaryInfo and SupplementaryInfo.Item components.
• Small scout to use one custom SVG for the separator dot instead of three.

[rpt-uk-github]

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[codacy-production]

Coverage summary from Codacy

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Coverage variation	Diff coverage
Report missing for e1c0d061	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (e1c0d06)	Report Missing	Report Missing	Report Missing
Head commit (9d8d36b)	8264	7627	92.29%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#702)	3	3	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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