Added unified assembler syntax mode so it can be selected with $ASMMODE.
Fixed bug in Mov instruction.
Added initial scanning of IT/LastInIT detection for proper instruction selection.
Disabled "wide" format flag detection again for now.

git-svn-id: http://svn.freepascal.org/svn/fpc/branches/laksen@29338 3ad0048d-3df7-0310-abae-a5850022a9f2