Moved the GenderFluid Logic to be more generic

Source/Common/Defs/TickBasedChanceExtension.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Verse;
+
+namespace RJW_Genes
+{
+    public class TickBasedChanceExtension : TickIntervalExtension
+    {
+        /// <summary>
+        /// Set to 1 for "always", set to 0 for "never". 
+        /// Everything else is a bit statistics, but e.g. when set to .5 the chances grow per day from [50%, 75%, 82.25%, ...]
+        /// </summary>
+        public float eventChance;
+    }
+}