online Unicode Utilities updated to 15.1 beta

[Markus Scherer]

Dear Unicoders,

We have updated the online Unicode Utilities to optionally use properties &
data from Unicode 15.1 beta <https://www.unicode.org/review/pri480/>.
Append a "β" to the property name for the new values. (Otherwise you will
still see 15.0 results.)

For example:

   - [:IDS_Unary_Operatorβ:]
   <https://util.unicode.org/UnicodeJsps/list-unicodeset.jsp?a=%5B%3AIDS_Unary_Operator%CE%B2%3A%5D&g=&i=>
   - compare <https://util.unicode.org/UnicodeJsps/unicodeset.jsp>
[:XID_Continue:]
   vs. [:XID_Continueβ:]
      - Note: This one seems to have a display bug: 15.1 XIDC includes both
      \u200C and \u200D but the set pattern does not escape the \u200D
to make it
      visible.
      - See also [[:XID_Continueβ:]-[:XID_Continue:]]
      <https://util.unicode.org/UnicodeJsps/list-unicodeset.jsp?a=[%5b%3aXID%5fContinue%ce%b2%3a%5d-%5b%3aXID%5fContinue%3a%5d]>
   - [:Blockβ=CJK_Unified_Ideographs_Extension_I:]
   <https://util.unicode.org/UnicodeJsps/list-unicodeset.jsp?a=[:Block%CE%B2=CJK_Unified_Ideographs_Extension_I:]>

Best regards,
markus on behalf of your properties & algorithms group
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