Move Weather effects into a separate resource

These weather effects are used TSG, TDG, and other WIP campaign revisions. Duplicating them across each campaign seems pointless, so I've moved them into a resource here, following the precedent set by #9669.

copyrights.csv

@@ -333,6 +333,8 @@ Date,File,License,Author - Real Name(other name);Real Name(other name);etc,Notes
 2007/05/16,data/core/sounds/zombie-hit-4.ogg,GNU GPL v2+,Lari Nieminen(zookeeper),,,18325a354006ff75a51d8a194ab4cc6b
 2007/05/16,data/core/sounds/zombie-hit-5.ogg,GNU GPL v2+,Lari Nieminen(zookeeper),,,5342ea54cf24b3bfec6b694ae864587e
 2007/05/16,data/core/sounds/zombie-hit-6.ogg,GNU GPL v2+,Lari Nieminen(zookeeper),,,9073318991b1a956c33e65290bfdf78c
+2025/01/10,data/resources/Weather/sounds/weather-rain.ogg,GNU GPL v2+,(inferno8);(dalas),,,fc7090377ce25be51526afc235557735
+2025/01/10,data/resources/Weather/sounds/weather-snow.ogg,CC0,(kyles),,,5b4d185ae84eaf3a7bb20c83f441327c
 2007/05/16,sounds/arrive.wav,GNU GPL v2+,unknown;Lari Nieminen(zookeeper),,,c7c0a7f2b0ab2e501602fa8ed629b691
 2018/03/04,sounds/bell.wav,CC BY-SA 4.0,Argentum Age,,,16e38871229e0ee808d427ab2389252a
 2018/03/04,sounds/button.wav,CC BY-SA 4.0,Argentum Age,,,65a417effb06381a81e85883821becc9

data/resources/Weather/_main.cfg

@@ -0,0 +1,91 @@
+#textdomain wesnoth-campaign-resources
+[textdomain]
+    name="wesnoth-campaign-resources"
+[/textdomain]
+
+#
+# This is a resource intended for use in select mainline campaigns, and should not be relied upon for UMC.
+# It may change in ways that aren't backwards-compatible with or that negatively affect the balance of UMC content that uses it.
+#
+#ifdef RESOURCE_WEATHER
+[binary_path]
+    path=data/resources/Weather
+[/binary_path]
+
+#define ADD_WEATHER_RAIN
+    [terrain_graphics]
+        map="
+1
+,1
+1
+,1"
+        [tile]
+            pos=1
+            set_flag=rain
+            no_flag=rain
+        [/tile]
+        [image]
+            layer=1
+            # make the initial frame noweather.png so that disabling rain in Preferences->Display->Animate Map removes it completely instead of freezing it.
+            # but we don't actually want to show it to the player normally, so give it a 0ms duration
+            name=noweather.png:0,rain/rain-[1~5].png~O(0.5):80
+        [/image]
+    [/terrain_graphics]
+    [terrain_graphics]
+        [tile]
+            x=0
+            y=0
+            set_flag=rain
+            no_flag=rain
+        [/tile]
+        [image]
+            layer=1
+            name=noweather.png:0,rain/rain-[1~5].png~O(0.5):80
+        [/image]
+    [/terrain_graphics]
+    [sound_source]
+        id=rain
+        sounds="weather-rain.ogg"
+        delay=0
+        chance=100
+        loop=-1
+        x,y=1,1
+        full_range=9999
+        check_fogged=no
+        check_shrouded=no
+    [/sound_source]
+#enddef
+
+#define ADD_WEATHER_SNOW
+    [terrain_graphics]
+        [tile]
+            x,y=0,0
+        [/tile]
+        [image]
+            layer=1
+            name=noweather.png:0,snow/whiteout.png:60000
+        [/image]
+    [/terrain_graphics]
+    [terrain_graphics]
+        [tile]
+            x,y=0,0
+        [/tile]
+        [image]
+            layer=1
+            name=noweather.png:0,snow/00[01~33].png~O(0.6):80
+        [/image]
+    [/terrain_graphics]
+    [sound_source]
+        id=snow
+        sounds="weather-snow.ogg"
+        delay=0
+        chance=100
+        loop=-1
+        x,y=1,1
+        full_range=9999
+        check_fogged=no
+        check_shrouded=no
+    [/sound_source]
+#enddef
+
+#endif