~hww3/org.openhab.binding.weatherflowsmartweather

more updates for 4.0
Add start of "grey market" air quality sensor
Adding instructions for the weathercard widget
for some odd reason the type adapters here were overflowing the stack, so we'll just generat the json manually.
add accidentally removed channels
add WIP weather card widget and sample forecast data
add support for Better Forecast data
fix lightning strike and precipitation triggers. also improve logging when event handling fails.
fix a typo that prevented the RapidWind trigger from actually triggering. Also added another example.
Fix a copy/paste error.
add notes on contributing
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