Add remaining SVG icons in editor toolbar

See the associated Pull Request, which adds 14 more SVG icons, adjusts two existing ones, and reuses some existing ones for newly identified duplicates. See NETBEANS-2617 for a more detailed description of this effort.

The Adobe Illustrator file that was used to produce the latest icons is attached here. I haven't cleaned up the Illustrator file, so it may contain some duplicates from previous Illustrator file in NETBEANS-2617.