Add inset (and sub-properties) to positioning

[web-swpl]

trafficstars

The positioning group was lacking the following CSS properties:

• inset
• inset-block
• inset-block-start
• inset-block-end
• inset-inline
• inset-inline-start
• inset-inline-end

These properties have been added right under position and above top.

[web-swpl]

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