Predicted stamina (#12413)

* Predicted stamina

Needed to do some semblence of predicted melee.

* Okay now done.

* Pause support

* Comment

Content.Shared/Damage/Components/StaminaComponent.cs

@@ -0,0 +1,48 @@
+using Robust.Shared.GameStates;
+using Robust.Shared.Serialization.TypeSerializers.Implementations;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom;
+
+namespace Content.Shared.Damage.Components;
+
+/// <summary>
+/// Add to an entity to paralyze it whenever it reaches critical amounts of Stamina DamageType.
+/// </summary>
+[RegisterComponent, NetworkedComponent]
+public sealed class StaminaComponent : Component
+{
+    /// <summary>
+    /// Have we reached peak stamina damage and been paralyzed?
+    /// </summary>
+    [ViewVariables(VVAccess.ReadWrite), DataField("critical")]
+    public bool Critical;
+
+    /// <summary>
+    /// How much stamina reduces per second.
+    /// </summary>
+    [ViewVariables(VVAccess.ReadWrite), DataField("decay")]
+    public float Decay = 3f;
+
+    /// <summary>
+    /// How much time after receiving damage until stamina starts decreasing.
+    /// </summary>
+    [ViewVariables(VVAccess.ReadWrite), DataField("cooldown")]
+    public float DecayCooldown = 5f;
+
+    /// <summary>
+    /// How much stamina damage this entity has taken.
+    /// </summary>
+    [ViewVariables(VVAccess.ReadWrite), DataField("staminaDamage")]
+    public float StaminaDamage;
+
+    /// <summary>
+    /// How much stamina damage is required to entire stam crit.
+    /// </summary>
+    [ViewVariables(VVAccess.ReadWrite), DataField("excess")]
+    public float CritThreshold = 100f;
+
+    /// <summary>
+    /// To avoid continuously updating our data we track the last time we updated so we can extrapolate our current stamina.
+    /// </summary>
+    [ViewVariables, DataField("lastUpdate", customTypeSerializer:typeof(TimeOffsetSerializer))]
+    public TimeSpan NextUpdate = TimeSpan.Zero;
+}