• Support msymbol 'S-C-Return' as a commit to preedit key (Resolves #457). Needed by hi-itrans.mim, hi-optitransv2.mim, kn-optitransv2.mim, mr-gamabhana.mim, sa-itrans.mim, sa-vedic-itrans.mim
• Remove useless m4/{Makefile.am,as-version.m4}
• Update emoji annotations from CLDR
• Update UnicodeData.txt to current Unicode 15.1.0 draft (https://www.unicode.org/Public/draft/UCD/ucd/UnicodeData.txt)
• Update emoji data files for current Unicode 15.1 DRAFT (https://www.unicode.org/Public/draft/UCD/ucd/emoji/emoji-data.txt https://www.unicode.org/Public/draft/UCD/ucd/emoji/emoji-variation-sequences.txt)