8309748: Improve host selection in External Specifications page

[hns]

Please review a change to improve selection by host name in the External Specifications page. After trying a list of checkboxes as used in the API summary pages and finding it not a suitable solution, I found that a select/dropdown menu works best for this page.

• New external specs page
• Old external specs page for comparsion

I also updated @spec tags in java.lang.Character to point to www.unicode.org rather than unicode.org to avoid a unicode.org entry in the host list (other @spec tags use the www.unicode.org host name). The short unicode.org URL is still used elsewhere in the java.lang.Character class, I can update those links to the canonical host name as well if desired.

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Progress

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Issue

• JDK-8309748: Improve host selection in External Specifications page (Enhancement - P3)

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[bridgekeeper]

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[openjdk]

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Webrevs

• 01: Full - Incremental (fe88df58)
• 00: Full (4587271c)