- change gimp_devices_get_list() to gimp_devices_get_manager()
- remove gimp_devices_get_current()
- let GimpDeviceStatus connect to the manager's "notify::current-device"
directly and remove device status updating code from gui.c
- cleanup in gimpdevices.c
Keep the comment at the place where calling it isn't immediately
obvious, and add checks to proximity_in() and out() so they bail out
when the proximity state is already set correctly.
and use them instead of manually setting proximity. Also add comments
about why we call the proximity functions where we call them (instead
of calling them where it seems more logical).
