SAM-1817 show/hide rich-text editor turned out to be a fair bit of refactoring and moving the functions into a samigo-global.js and out of the RichTextEditArea.java file


git-svn-id: https://source.sakaiproject.org/svn/sam/trunk@314602 66ffb92e-73f9-0310-93c1-f5514f145a0a