Weather improvements

* Reimplemented weather using renpy image methods
* Fixed weather causing fps drop
* Added cached weather results to the main room
* Reduced animation overhead
* Removed weather screen
* Unified day and night cloud images

game/scripts/events/ending.rpy

@@ -2739,7 +2739,6 @@ label ball_ending_E2:
 
     $ game.weather = "random"
     call weather_sound
-    show screen weather
 
     show screen main_room
     $ chair_OBJ.hidden = False

game/scripts/rooms/main_room/init.rpy

@@ -25,12 +25,13 @@ screen main_room():
     sensitive room_menu_active
 
     default objects = sorted(main_room.objects, key=lambda x: x.zorder)
+    default weather = "weather_[game.weather]"
 
     # Hotkeys
     if room_menu_active and game.day > 1 and not renpy.android:
         use hotkeys_main
 
-    use weather
+    add weather pos (430, 218) anchor (0.5, 0.5)
 
     # Walls
     if game.daytime: