Fxed an issue with random encounters, added a repeatable property, add event for abandoning encounters

Runtime/EncounterContext.cs

@@ -2,6 +2,10 @@ namespace Jovian.EncounterSystem {
     /// <summary>Per-resolution scratch object passed to every event handler. Extend with fields as handlers need them.</summary>
     public class EncounterContext {
         public IEncounter CurrentEncounter { get; }
+        public EncounterRegistry Registry { get; set; }
+
+        /// <summary>Set to <c>true</c> to halt processing of remaining events.</summary>
+        public bool ShouldStopEvents { get; set; }
 
         public EncounterContext(IEncounter currentEncounter) {
             CurrentEncounter = currentEncounter;