Expeditions rework (#18960)

Content.Shared/Procedural/Loot/RandomSpawnsLoot.cs

@@ -0,0 +1,33 @@
+using Content.Shared.Random;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+
+namespace Content.Shared.Procedural.Loot;
+
+/// <summary>
+/// Randomly places loot in free areas inside the dungeon.
+/// </summary>
+public sealed partial class RandomSpawnsLoot : IDungeonLoot
+{
+    [ViewVariables(VVAccess.ReadWrite), DataField("entries", required: true)]
+    public List<RandomSpawnLootEntry> Entries = new();
+}
+
+[DataDefinition]
+public partial record struct RandomSpawnLootEntry : IBudgetEntry
+{
+    [ViewVariables(VVAccess.ReadWrite), DataField("proto", required: true, customTypeSerializer:typeof(PrototypeIdSerializer<EntityPrototype>))]
+    public string Proto { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Cost for this loot to spawn.
+    /// </summary>
+    [ViewVariables(VVAccess.ReadWrite), DataField("cost")]
+    public float Cost { get; set; } = 1f;
+
+    /// <summary>
+    /// Unit probability for this entry. Weighted against the entire table.
+    /// </summary>
+    [ViewVariables(VVAccess.ReadWrite), DataField("prob")]
+    public float Prob { get; set; } = 1f;
+}