text_area() properly sanitizes HTML attributes.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5137 2fea6a4d-a838-0410-917b-93a53c48e9d2
Cast to integer.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5138 2fea6a4d-a838-0410-917b-93a53c48e9d2
Minor tweaks so write screen icons x3

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5139 2fea6a4d-a838-0410-917b-93a53c48e9d2