simplified support for icons in the tiddler toolbar's More menu
simplified support for icons in the tiddler toolbar's More menu

rendered duplicate functionality obsolete by extending the selector in
augmentCommandButtons; now augments all buttons the toolbar (rather than
just direct descendants)

This reverts commits 1caf0bc407cc4f44e61e6e274250faacc3d6a334 and
64f6fcfe035deb6914ae22644b5732ef92869577.

FND/tiddlyspace,TiddlySpace/tiddlyspace,TiddlySpace/tiddlyspace,TiddlySpace/tiddlyspace,FND/tiddlyspace,FND/tiddlyspace