Cluster grenade refactor and contra markings (space-wizards#31108)

* Cluster grenade refactor

* oopsies on the name

* Solve client-side errors

* reviews addressed

* filling scattering grenades is now predicted

* reviews addressed

Content.Client/Explosion/ScatteringGrenadeSystem.cs

@@ -0,0 +1,8 @@
+using Content.Shared.Explosion.EntitySystems;
+
+namespace Content.Client.Explosion;
+
+public sealed class ScatteringGrenadeSystem : SharedScatteringGrenadeSystem
+{
+
+}

Content.Server/Explosion/Components/ProjectileGrenadeComponent.cs

@@ -0,0 +1,48 @@
+using Content.Server.Explosion.EntitySystems;
+using Robust.Shared.Containers;
+using Robust.Shared.Prototypes;
+
+namespace Content.Server.Explosion.Components;
+/// <summary>
+/// Grenades that, when triggered, explode into projectiles
+/// </summary>
+[RegisterComponent, Access(typeof(ProjectileGrenadeSystem))]
+public sealed partial class ProjectileGrenadeComponent : Component
+{
+    public Container Container = default!;
+
+    /// <summary>
+    /// The kind of projectile that the prototype is filled with.
+    /// </summary>
+    [DataField]
+    public EntProtoId? FillPrototype;
+
+    /// <summary>
+    ///     If we have a pre-fill how many more can we spawn.
+    /// </summary>
+    public int UnspawnedCount;
+
+    /// <summary>
+    ///     Total amount of projectiles
+    /// </summary>
+    [DataField]
+    public int Capacity = 3;
+
+    /// <summary>
+    ///     Should the angle of the projectiles be uneven?
+    /// </summary>
+    [DataField]
+    public bool RandomAngle = false;
+
+    /// <summary>
+    /// The minimum speed the projectiles may come out at
+    /// </summary>
+    [DataField]
+    public float MinVelocity = 2f;
+
+    /// <summary>
+    /// The maximum speed the projectiles may come out at
+    /// </summary>
+    [DataField]
+    public float MaxVelocity = 6f;
+}