Changes

Weather system was changed to more generic one. Elevation ranges of sun profiles might be any real value now (not just 5 degree grid), transition now can mix up to 4 textures on sky and can happen anytime - so no longer locked weather because of sky textures in specific times. Also, thanks to unlimited transition, there is no need for various climates and weathers to meet in any evelation point.

Climate profile can now specify usage of skyboxes of different climate (attribute '''copy''') with few tweaks ('''weights''', '''temperatures'''). Copied climates are shown and can be edited in weather editor, but won't be saved.

Sun profile has few new attributes. Attribute '''stability''' defines chance of locking sky index for following sun profile (0.0 = completely random, 1.0 = sky index stays if possible).