Big changes 2

- Split into several projects
- All dalamud/lumina deps are in the plugin
- Crafty/craftingway sim implemented!
- optimizations to follow

Solver/Crafty/Arena.cs

@@ -0,0 +1,29 @@
+namespace Craftimizer.Solver.Crafty;
+
+public class Arena<T> where T : struct
+{
+    public readonly record struct Node
+    {
+        public int? Parent { get; init; }
+        public int Index { get; init; }
+        public List<int> Children { get; init; }
+        public T State { get; init; }
+    }
+
+    public List<Node> Nodes { get; } = new();
+
+    public Arena(T initialState = default)
+    {
+        Nodes.Add(new() { Parent = null, Index = 0, Children = new(), State = initialState });
+    }
+
+    public int Insert(int parentIndex, T state)
+    {
+        var index = Nodes.Count;
+        Nodes.Add(new() { Parent = parentIndex, Index = index, Children = new(), State = state });
+        Nodes[parentIndex].Children.Add(index);
+        return index;
+    }
+
+    public Node Get(int index) => Nodes[index];
+}