Re: [whatwg/encoding] Remove the last 14 characters PUA of GB18030-2005 (#27)

@Artoria2e5: The reasons why Source Han Sans (and the Google-branded Noto Sans CJK) does not support the 24 PUA code points of GB 18030 are because 1) PUA code points should be avoided in general; 2) PUA code points should especially be avoided when mixing multiple standards, which is the case for Pan-CJK fonts; 3) a GB 18030 revision is expected to be published soon that will specify the non-PUA code points for these 24 characters, which will effectively lift the PUA requirement; 4) the 24 characters have had non-PUA code points for over a decade; and 5) the "release" branch of Source Han Sans includes a [utf32-gb18030pua24.map](https://github.com/adobe-fonts/source-han-sans/blob/release/Resources/utf32-gb18030pua24.map) file that provides the 24 PUA mappings for those developers who need support for these PUA code points.

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