WeatherLetterExtensions

This allows a weather to send a letter when starting. Add it to the <modExtensions> tag of your WeatherDef. Here is an example of use:

<li Class="VFECore.WeatherLetterExtensions">
  <letterDef>NeutralEvent</letterDef>
  <letterTitle>Hail</letterTitle>
  <letterText>Pellets of frozen rain fall from cumulonimbus clouds. Any person or creature not under the roof risks getting injured by them.</letterText>
</li>