further refactored TiddlySpaceToolbar
further refactored TiddlySpaceToolbar

instead of hard-coding a list of commands to be augmented with an icon,
we look at the commands and augment them if a corresponding SVG tiddler
is available

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