Overcast addon for PWM v5.0

You need full version of Piva Weather mod 5.0 for this addons.

This addons do not remove sunny skyboxes, but change probability of overcast weather.
With very light fog (g_set_skybox 20) and kight fog (g_set_skybox 21).
Also added light rain with light fog for bad wetaher (g_set_skybox 9)
You can test this settings if you change skybox in command console with given commands
Climate mediteran was not changed, so on south Italy climate stay the same.
At first I want change climate for UK and Scandinavia, but it impossible to do without map update,
so now I change default climate (and all others for ProMod map)