Re-organize all projects (#4166)

Content.Server/Climbing/ClimbSystem.cs

@@ -0,0 +1,38 @@
+using System.Collections.Generic;
+using System.Linq;
+using Content.Server.Climbing.Components;
+using Content.Shared.GameTicking;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.Climbing
+{
+    [UsedImplicitly]
+    internal sealed class ClimbSystem : EntitySystem, IResettingEntitySystem
+    {
+        private readonly HashSet<ClimbingComponent> _activeClimbers = new();
+
+        public void AddActiveClimber(ClimbingComponent climbingComponent)
+        {
+            _activeClimbers.Add(climbingComponent);
+        }
+
+        public void RemoveActiveClimber(ClimbingComponent climbingComponent)
+        {
+            _activeClimbers.Remove(climbingComponent);
+        }
+
+        public override void Update(float frameTime)
+        {
+            foreach (var climber in _activeClimbers.ToArray())
+            {
+                climber.Update();
+            }
+        }
+
+        public void Reset()
+        {
+            _activeClimbers.Clear();
+        }
+    }
+}