Updated xml syntax definitions from kate repository.
Made regex matches respect 'case-insensitive'.

This should fix pandoc #1285.
Added blank itemDatas to alert_indent.xml.
Added gcc and isocpp, needed by cpp.
Bump version to 0.5.7.
Updated changelog.
Fix typo in list append operator in pcre-light-using code.
Merge pull request #41 from clinty/master

Fix typo in list append operator in pcre-light-using code.
Drop pcre-light flag: it does not handle unicode properly.
Import PCRE ByteString backend (the PCRE String backend does not support unicode properly).
Fix string bytestring conversions, enable utf8 in compiled regexp.
Copy experimental agda syntax file (see https://git.reviewboard.kde.org/r/117167/).
Update cabal.
Mention Agda in readme.