Create annotated image and persit its URL

[#54482648]
ImageQuestionAnswer: Clean up forms & svg-edit
ImageQuestionAnswer : javascript new button action
ImageQuestionAnswer: Undo deleted annotations too.
ImageQuestionAnswer: Remove undo button.
ImageQuestionAnswer: js extract $annotation_field
ImageQuestionAnswer: remove unused function
ImageQuestionAnswer : Remove more unused @vars
ImageAnswer: mv set_background ➙ update_display
ignore conf & backup files: vim, floobits, sublime
ImageAnswer: Update thumbnail, fix alignment.

ImageAnswer annotations weren't lining up with 
the background image.  The preview includes annotations.