Weather effects (#12528)

Co-authored-by: metalgearsloth <metalgearsloth@gmail.com>

Content.Shared/Weather/WeatherComponent.cs

@@ -0,0 +1,43 @@
+using Robust.Shared.Audio;
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Weather;
+
+[RegisterComponent, NetworkedComponent]
+public sealed class WeatherComponent : Component
+{
+    /// <summary>
+    /// Currently running weather.
+    /// </summary>
+    [ViewVariables, DataField("weather")]
+    public string? Weather;
+
+    // now
+    public IPlayingAudioStream? Stream;
+
+    /// <summary>
+    /// When the weather started.
+    /// </summary>
+    [ViewVariables, DataField("startTime")]
+    public TimeSpan StartTime = TimeSpan.Zero;
+
+    /// <summary>
+    /// When the applied weather will end.
+    /// </summary>
+    [ViewVariables(VVAccess.ReadWrite), DataField("endTime")]
+    public TimeSpan EndTime = TimeSpan.Zero;
+
+    [ViewVariables]
+    public TimeSpan Duration => EndTime - StartTime;
+
+    [ViewVariables]
+    public WeatherState State = WeatherState.Invalid;
+}
+
+public enum WeatherState : byte
+{
+    Invalid = 0,
+    Starting,
+    Running,
+    Ending,
+}