Removed the IFloatProperties interface (#3570)

* [skip ci] Remove IFloatProperties interface

* [skip ci] Update the examples

* Updating the documentation

Project/Assets/ML-Agents/Examples/3DBall/Scripts/Ball3DAgent.cs

     [Header("Specific to Ball3D")]
     public GameObject ball;
     Rigidbody m_BallRb;
-    IFloatProperties m_ResetParams;
+    FloatPropertiesChannel m_ResetParams;
 
     public override void InitializeAgent()
     {

Project/Assets/ML-Agents/Examples/3DBall/Scripts/Ball3DHardAgent.cs

     [Header("Specific to Ball3DHard")]
     public GameObject ball;
     Rigidbody m_BallRb;
-    IFloatProperties m_ResetParams;
+    FloatPropertiesChannel m_ResetParams;
 
     public override void InitializeAgent()
     {

Project/Assets/ML-Agents/Examples/Bouncer/Scripts/BouncerAgent.cs

     int m_NumberJumps = 20;
     int m_JumpLeft = 20;
 
-    IFloatProperties m_ResetParams;
+    FloatPropertiesChannel m_ResetParams;
 
     public override void InitializeAgent()
     {

Project/Assets/ML-Agents/Examples/GridWorld/Scripts/GridArea.cs

 
     public GameObject trueAgent;
 
-    IFloatProperties m_ResetParameters;
+    FloatPropertiesChannel m_ResetParameters;
 
     Camera m_AgentCam;
 

Project/Assets/ML-Agents/Examples/Tennis/Scripts/TennisAgent.cs

     Rigidbody m_AgentRb;
     Rigidbody m_BallRb;
     float m_InvertMult;
-    IFloatProperties m_ResetParams;
+    FloatPropertiesChannel m_ResetParams;
 
     // Looks for the scoreboard based on the name of the gameObjects.
     // Do not modify the names of the Score GameObjects

Project/Assets/ML-Agents/Examples/Walker/Scripts/WalkerAgent.cs

     Rigidbody m_ChestRb;
     Rigidbody m_SpineRb;
 
-    IFloatProperties m_ResetParams;
+    FloatPropertiesChannel m_ResetParams;
 
     public override void InitializeAgent()
     {

com.unity.ml-agents/CHANGELOG.md

  - 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)
+ - The `IFloatProperties` interface has been removed.
 
 ## [0.14.1-preview] - 2020-02-25
 

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

         /// <summary>
         /// Collection of float properties (indexed by a string).
         /// </summary>
-        public IFloatProperties FloatProperties;
+        public FloatPropertiesChannel FloatProperties;
 
 
         // Fields not provided in the Inspector.

com.unity.ml-agents/Runtime/SideChannels/FloatPropertiesChannel.cs

 namespace MLAgents.SideChannels
 {
     /// <summary>
-    /// Interface for managing a collection of float properties keyed by a string variable.
-    /// </summary>
-    public interface IFloatProperties
-    {
-        /// <summary>
-        /// Sets one of the float properties of the environment. This data will be sent to Python.
-        /// </summary>
-        /// <param name="key"> The string identifier of the property.</param>
-        /// <param name="value"> The float value of the property.</param>
-        void SetProperty(string key, float value);
-
-        /// <summary>
-        /// Get an Environment property with a default value. If there is a value for this property,
-        /// it will be returned, otherwise, the default value will be returned.
-        /// </summary>
-        /// <param name="key"> The string identifier of the property.</param>
-        /// <param name="defaultValue"> The default value of the property.</param>
-        /// <returns></returns>
-        float GetPropertyWithDefault(string key, float defaultValue);
-
-        /// <summary>
-        /// Registers an action to be performed everytime the property is changed.
-        /// </summary>
-        /// <param name="key"> The string identifier of the property.</param>
-        /// <param name="action"> The action that ill be performed. Takes a float as input.</param>
-        void RegisterCallback(string key, Action<float> action);
-
-        /// <summary>
-        /// Returns a list of all the string identifiers of the properties currently present.
-        /// </summary>
-        /// <returns> The list of string identifiers </returns>
-        IList<string> ListProperties();
-    }
-
-    /// <summary>
-    public class FloatPropertiesChannel : SideChannel, IFloatProperties
+    public class FloatPropertiesChannel : SideChannel
     {
         Dictionary<string, float> m_FloatProperties = new Dictionary<string, float>();
         Dictionary<string, Action<float>> m_RegisteredActions = new Dictionary<string, Action<float>>();

docs/Migrating.md

 * `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.
+* The `IFloatProperties` interface has been removed.
 
 ### Steps to Migrate
 * Add the `using MLAgents.Sensors;` in addition to `using MLAgents;` on top of your Agent's script.
  iterate through `RayPerceptionOutput.rayOutputs` and call `RayPerceptionOutput.RayOutput.ToFloatArray()`.
 * Re-import all of your `*.NN` files to work with the updated Barracuda package.
-* Replace all calls to `Agent.GetStepCount()` with `Agent.StepCount`
+* Replace all calls to `Agent.GetStepCount()` with `Agent.StepCount`.
+* Replace `IFloatProperties` variables with `FloatPropertiesChannel` variables.
 
 ## Migrating from 0.13 to 0.14