Move weather mods to ENVIRONMENT modpack

mods/ENVIRONMENT/weather_pack/README.md

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+weather-pack
+=======================
+Weather mod for Minetest (http://minetest.net/)
+
+Weathers included
+-----------------------
+* rain
+* snow
+* thunder
+
+Commands
+-----------------------
+`set_weather <weather>` requires `weather_manager` privilege.
+
+Dependencies
+-----------------------
+Thunder weather requres [lightning](https://github.com/minetest-mods/lightning) mod.
+
+Configuration properties
+-----------------------
+Weather mod for indoor check depends on sunlight propogation check. Some nodes (e.g. glass block) propogates sunlight and thus weather particles will go through it. To change that set `weather_allow_override_nodes=true` in `minetest.conf` file. Be aware that just few nodes will be override and these blocks needs to be re-builded to take effect. Maybe in future other 'cheap' way to check indoor will be available.
+
+Weather mod mostly relies on particles generation however for some small things ABM may be used. Users which do not want it can disable ABM with property `weather_allow_abm=false`.
+
+License of source code:
+-----------------------
+LGPL 2.1+
+
+Authors of media files:
+-----------------------
+
+TeddyDesTodes:
+Snowflakes licensed under CC-BY-SA 3.0 by from weather branch at https://github.com/TeddyDesTodes/minetest/tree/weather
+
+  * `weather_pack_snow_snowflake1.png` - CC-BY-SA 3.0
+  * `weather_pack_snow_snowflake2.png` - CC-BY-SA 3.0
+
+xeranas:
+
+  * `weather_pack_rain_raindrop_1.png` - CC-0
+  * `weather_pack_rain_raindrop_2.png` - CC-0
+  * `weather_pack_rain_raindrop_3.png` - CC-0
+
+inchadney (http://freesound.org/people/inchadney/):
+
+  * `weather_rain.ogg` - CC-BY-SA 3.0 (cut from http://freesound.org/people/inchadney/sounds/58835/)
+