Don't allow textareas to be resized

Textareas for notes are a good size. Trying to resize them results in
problems with the dialog.
Show user note in tooltip

Hovering over the user note button will show the existing user note in a
tooltip.
Synchronize data between tabs

The same game loaded in more than one tab needs data synchronized on
save. Lots of message passing but it should work fine. Updates to the
DOM on non-active tabs is fast.