Draw volumetric clouds, their shadows, a volumetric fog and catalogue stars from a new weather system in the GL 4.6 renderer

widgets/weatherpanel.h

@@ -0,0 +1,22 @@
+/*
+This Source Code Form is subject to the
+terms of the Mozilla Public License, v.
+2.0. If a copy of the MPL was not
+distributed with this file, You can
+obtain one at
+http://mozilla.org/MPL/2.0/.
+*/
+
+#pragma once
+
+class world_weather;
+
+namespace ui
+{
+
+// controls of the weather of the simulation (environment/weather.h): a report or weather entries to apply, the layers of clouds,
+// the fog, the precipitation and the wind at the clouds. what is changed applies to this computer at once, without being sent
+// over the network. returns true when the weather was changed
+bool weather_controls(world_weather &Weather);
+
+} // namespace ui