Abaqus support

Support for Abaqus inp files (scintilla lexer, file type and tag manager)

Scintilla lexer comes from current scintilla svn.
Added corresponding filetypes.abaqus with keywords.
Added tag manager for the Parts section, the Assembly section and the Steps section.
Tested and confirmed working.

test file : https://gist.github.com/4452894

Signed-off-by: touste