Reorganise confluence weather

Sub folders created under 720p/weather/ containing skin files
used by particular weather addons. Chiefly these are LeftPane,
RightPane and SideBlade. Makes MyWeather.xml a whole lot simpler.
Update to reflect most up to date changes to MyWeather.xml
Rename Wunderground includes from 'Weather...' to 'Wunderground...'
<left> instead of <posx>, <top> instead of <posy>
Reposition some fields in LeftPane

Assume its because functionality of <align> has changed.
Reposition Issued-At labels
Moved icons from weather.metoffice into skin
Remove UVColour property
Remove WindIcon and GustIcon proerties. Generate these inline using three argument []
Weather.MetOffice: added support for forecast maps.
Fix positioning using Frodo's posx posy.