Add key for temperature layer
Add key for rainfall layer
Rename 'Regional Text...' to 'Text...'
Create group so title bar is shown even when data not fetched
Add greyed out underlay when forecast isnt fetched
Show key when layer is not selected
Remove 'fetching forecast' message
Add mph to wind gust label
Impliment fade when working.

replaces busydialog
busydialog increased delay, and appeared too soon, resulting in
flickering when data is fetched immediately.