Added a bunch of utilities and modfief the character data structue

Assets/Code/GameState/Entities/ModifiersFactory.cs

@@ -10,7 +10,7 @@ namespace Nox.Game {
         bool TryAddModifier(CharacterDefinition character, string modiferId);
     }
 
-    public enum ModifierType {
+    public enum ModifierRole {
         None,
         Flat,
         Addition,
@@ -20,8 +20,11 @@ namespace Nox.Game {
 
     [Serializable]
     public sealed class ModifierDefinition {
-        public ModifierIds id;
-        public ModifierType type;
+        [ReadOnlyField]
+        public System.Guid id = Guid.NewGuid();
+        public StatType statType;
+        public AttributeType attributeType;
+        public ModifierRole role;
         public float value;
     }