EEditorTableDialog: Rework the insertion of a new table
EEditorImageDialog: Fix "follow" unit for image resize
EEditorSelection: When inserting new image mark EEditorWidget as changed
EEditorWidget: Don't remove smiley image representation when changing composer mode
Implement image resizing in HTML mode with CSS

Right now it allows just resizing above original sizes due to WebKit bug
https://bugs.webkit.org/show_bug.cgi?id=72948