1.0.3dev: fixed not loading additional stylesheets during the automatic preview of wiki and ticket editing (closes #10470)

 - added `chrome_info_script` to `trac.web.chrome`
 - load stylesheets that are added by processors and macros on auto preview using script tags


git-svn-id: http://trac.edgewall.org/intertrac/log:/branches/1.0-stable@13328 af82e41b-90c4-0310-8c96-b1721e28e2e2