added PerformanceCounter

Barotrauma/BarotraumaShared/SharedSource/LuaCs/LuaCsPerformanceCounter.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+
+namespace Barotrauma
+{
+    public class LuaCsPerformanceCounter
+    {
+        public bool EnablePerformanceCounter = false;
+
+        public double UpdateElapsedTime;
+        public Dictionary<string, Dictionary<string, double>> HookElapsedTime = new Dictionary<string, Dictionary<string, double>>();
+
+        public static float MemoryUsage
+        {
+            get
+            {
+                Process proc = Process.GetCurrentProcess();
+                float memory = MathF.Round(proc.PrivateMemorySize64 / (1024 * 1024), 2);
+                proc.Dispose();
+
+                return memory;
+            }
+        }
+
+        public void SetHookElapsedTicks(string eventName, string hookName, long ticks)
+        {
+            if (!HookElapsedTime.ContainsKey(eventName)) 
+            { 
+                HookElapsedTime[eventName] = new Dictionary<string, double>(); 
+            }
+
+            HookElapsedTime[eventName][hookName] = (double)ticks / Stopwatch.Frequency;
+        }
+    }
+}