added second element type: snow

added simple snow weather

Scripts/Elements/Snow.cs

@@ -0,0 +1,23 @@
+using Godot;
+
+namespace FOU.Scripts.Elements;
+
+public class Snow : Solid {
+    public Snow(int x, int y, ref Level level) : base(x, y, ref level) {
+        Color = Colors.White;
+        Color = AddColorVariance(Color);
+    }
+
+    public override bool Update(int currentFrame) {
+        if (!base.Update(currentFrame)) return false;
+
+        Vector2I freePos = Check(this, Vector2I.Down);
+
+        if (freePos != Vector2I.Zero) { // diagonally right
+            Level.Swap(this, freePos);
+            return true;
+        }
+
+        return true; // not necessarily end, subclasses could do some more things
+    }
+}