Add AutoEmote comp/system, updates to zombie code (#13932)

* Add AutoEmote comp/system

* Reduce groan chance so it's the same as before

Old code did 0.2 and then 0.5, now it's just one Prob(0.1)

* Fix typo, curTime var, don't log Resolve

* Maybe fix pausing?

* Fix mistake

* Update NextEmoteTime if an auto emote is removed

* Fix stuff

Get CurTime outside update loop
Use MapInit instead of ComponentInit
Fix a typo in a comment
Debug assert prototype ID in RemoveEmote
Do += PausedTime in OnUnpaused
Add prototype as arg to ResetTimer to avoid an indexing

Content.Server/Chat/AutoEmoteComponent.cs

@@ -0,0 +1,32 @@
+namespace Content.Server.Chat;
+
+using Content.Server.Chat.Systems;
+using Content.Shared.Chat.Prototypes;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype.Set;
+
+/// <summary>
+/// Causes an entity to automatically emote at a set interval.
+/// </summary>
+[RegisterComponent, Access(typeof(AutoEmoteSystem))]
+public sealed class AutoEmoteComponent : Component
+{
+    /// <summary>
+    /// A set of emotes that the entity will preform.
+    /// <see cref="AutoEmotePrototype"/>
+    /// </summary>
+    [DataField("emotes", customTypeSerializer: typeof(PrototypeIdHashSetSerializer<AutoEmotePrototype>)), ViewVariables(VVAccess.ReadOnly)]
+    public HashSet<string> Emotes = new HashSet<string>();
+
+    /// <summary>
+    /// A dictionary storing the time of the next emote attempt for each emote.
+    /// Uses AutoEmotePrototype IDs as keys.
+    /// <summary>
+    [ViewVariables(VVAccess.ReadOnly)] //TODO: make this a datafield and (de)serialize values as time offsets when https://github.com/space-wizards/RobustToolbox/issues/3768 is fixed
+    public Dictionary<string, TimeSpan> EmoteTimers = new Dictionary<string, TimeSpan>();
+
+    /// <summary>
+    /// Time of the next emote. Redundant, but avoids having to iterate EmoteTimers each update.
+    /// </summary>
+    [ViewVariables(VVAccess.ReadOnly)]
+    public TimeSpan NextEmoteTime = TimeSpan.MaxValue;
+}