PairTagHighlighter: improve brackets search

Ignore brackets corresponding to php tags (<? <?php ?>)
and object operators (->). Thanks Peter Donin for bugreport!
PairTagHighlighter: enable SCLEX_XML lexer support
PairTagHighlighter: update version number to 1.1
Merge pull request #127 from vmkononenko/master

Update PairTagHighlighter to version 1.1