1. Allow character entity ( &#nnnn; ) to exceed 0xffff in HTMLParser::ScanText()
2. Return a character as sal_uInt32 ( utf32 ) instead of sal_Unicode ( utf16 )
   from SvParser::GetNextChar().

Conflicts:
	sw/qa/extras/htmlexport/htmlexport.cxx

Change-Id: Ida455040970fae800f0f11471b27f53461fb78e4
Reviewed-on: https://gerrit.libreoffice.org/21152Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Mark Hung <marklh9@gmail.com>