This is part 2...
Improve performance of selection via Selection bar
This provides a similar type of speed up when selecting with the keyboard via
the Selection toolbar.
Make Snap To project specific
This makes the Snap To setting in the selection bar project specific. Changing
it will no longer affect other open projects.
The state is saved to audacity.cfg when the checkbox is changed. This means
that the next project window to open will start with the new value. (As it
should be).
