#1 Active printer selection by menu

[David Marston]

The icon bar menu could be used to select the active
printer when multiple printers are configured. This
would mean that only the active printer would need to
be shown on the icon bar saving space.

This could be configurable for those who prefer the
current method. Each printer could also be given an
extra configuration option of 'always show on the icon
bar' for configurations where there are a small number
of often used printers which should always be shown on
the icon bar, but some rarely used printers.

There are a few different ways this could be
implemented which need to be considered before making
any changes.