Made the decision requester internal and renamed RepeatAction (#3555)

* [skip ci] made the decision requester internal and renamed RepeatAction

* [skip ci] Updated the migration

* Update com.unity.ml-agents/Runtime/DecisionRequester.cs

Co-Authored-By: Chris Elion <chris.elion@unity3d.com>

* Run tests

Co-authored-by: Chris Elion <celion@gmail.com>

com.unity.ml-agents/CHANGELOG.md

  - The `Agent` class is no longer abstract.
  - SensorBase was moved out of the package and into the Examples directory.
  - `AgentInfo.actionMasks` has been renamed to `AgentInfo.discreteActionMasks`.
-
+ - `DecisionRequester` has been made internal (you can still use the DecisionRequesterComponent from the inspector). `RepeatAction` was renamed `TakeActionsBetweenDecisions` for clarity. (#3555)
 
 ## [0.14.1-preview] - 2020-02-25
 

com.unity.ml-agents/Runtime/DecisionRequester.cs

-using System.Runtime.CompilerServices;
+using UnityEngine.Serialization;
 
 namespace MLAgents
 {
     /// </summary>
     [AddComponentMenu("ML Agents/Decision Requester", (int)MenuGroup.Default)]
-    public class DecisionRequester : MonoBehaviour
+    internal class DecisionRequester : MonoBehaviour
     {
         /// <summary>
         /// The frequency with which the agent requests a decision. A DecisionPeriod of 5 means
         [Tooltip("Indicates whether or not the agent will take an action during the Academy " +
                  "steps where it does not request a decision. Has no effect when DecisionPeriod " +
                  "is set to 1.")]
-        public bool RepeatAction = true;
+        [FormerlySerializedAs("RepeatAction")]
+        public bool TakeActionsBetweenDecisions = true;
 
         /// <summary>
         /// Whether or not the Agent decisions should start at an offset (different for each agent).
             {
                 m_Agent?.RequestDecision();
             }
-            if (RepeatAction)
+            if (TakeActionsBetweenDecisions)
             {
                 m_Agent?.RequestAction();
             }

docs/Migrating.md

 * `AgentInfo.actionMasks` has been renamed to `AgentInfo.discreteActionMasks`.
 * `BrainParameters` and `SpaceType` have been removed from the public API
 * `BehaviorParameters` have been removed from the public API.
+* `DecisionRequester` has been made internal (you can still use the DecisionRequesterComponent from the inspector). `RepeatAction` was renamed `TakeActionsBetweenDecisions` for clarity.
 
 ### Steps to Migrate
 * Add the `using MLAgents.Sensors;` in addition to `using MLAgents;` on top of your Agent's script.