initialized rules to remove build warnings

Author: StephenHodgson

Assets/MixedRealityToolkit/_Core/Definitions/InputSystem/MixedRealityInputActionRulesProfile.cs

@@ -10,47 +10,47 @@ namespace Microsoft.MixedReality.Toolkit.Core.Definitions.InputSystem
     public class MixedRealityInputActionRulesProfile : BaseMixedRealityProfile
     {
         [SerializeField]
-        private InputActionRuleDigital[] inputActionRulesDigital;
+        private InputActionRuleDigital[] inputActionRulesDigital = null;
 
         /// <summary>
         /// All the Input Action Rules for <see cref="bool"/> based <see cref="MixedRealityInputAction"/>s
         /// </summary>
         public InputActionRuleDigital[] InputActionRulesDigital => inputActionRulesDigital;
 
         [SerializeField]
-        private InputActionRuleSingleAxis[] inputActionRulesSingleAxis;
+        private InputActionRuleSingleAxis[] inputActionRulesSingleAxis = null;
 
         /// <summary>
         /// All the Input Action Rules for <see cref="float"/> based <see cref="MixedRealityInputAction"/>s
         /// </summary>
         public InputActionRuleSingleAxis[] InputActionRulesSingleAxis => inputActionRulesSingleAxis;
 
         [SerializeField]
-        private InputActionRuleDualAxis[] inputActionRulesDualAxis;
+        private InputActionRuleDualAxis[] inputActionRulesDualAxis = null;
 
         /// <summary>
         /// All the Input Action Rules for <see cref="Vector2"/> based <see cref="MixedRealityInputAction"/>s
         /// </summary>
         public InputActionRuleDualAxis[] InputActionRulesDualAxis => inputActionRulesDualAxis;
 
         [SerializeField]
-        private InputActionRuleVectorAxis[] inputActionRulesVectorAxis;
+        private InputActionRuleVectorAxis[] inputActionRulesVectorAxis = null;
 
         /// <summary>
         /// All the Input Action Rules for <see cref="Vector3"/> based <see cref="MixedRealityInputAction"/>s
         /// </summary>
         public InputActionRuleVectorAxis[] InputActionRulesVectorAxis => inputActionRulesVectorAxis;
 
         [SerializeField]
-        private InputActionRuleQuaternionAxis[] inputActionRulesQuaternionAxis;
+        private InputActionRuleQuaternionAxis[] inputActionRulesQuaternionAxis = null;
 
         /// <summary>
         /// All the Input Action Rules for <see cref="Quaternion"/> based <see cref="MixedRealityInputAction"/>s
         /// </summary>
         public InputActionRuleQuaternionAxis[] InputActionRulesQuaternionAxis => inputActionRulesQuaternionAxis;
 
         [SerializeField]
-        private InputActionRulePoseAxis[] inputActionRulesPoseAxis;
+        private InputActionRulePoseAxis[] inputActionRulesPoseAxis = null;
 
         /// <summary>
         /// All the Input Action Rules for <see cref="MixedRealityPose"/> based <see cref="MixedRealityInputAction"/>s