Give the toolbar buttons for control panel, advanced search and tag
manager the selected state when the corresponding tiddlers are open in
the story river.
Note: I did NOT test the results as I have yet to figure out how to make
node.js...
* actually run the server without a 403
* build the core tw after me having made changes
Reasons:
- can show or hide the button text with CSS (assuming
tv-config-toolbar-text is yes).
- can have different looking buttons in the page controls versus the
view toolbar, etc
- more flexibility styling the button appearance, for example you
can change the text size compared to the icon size
- button appearance is more themeable
