CHANGE: Refactor/clean up some APIs and add a batch of scripting API docs (#762).

Author: Rene Damm

Assets/Demo/OnScreenController/Prefabs.meta

@@ -4,6 +4,7 @@
 using UnityEngine.InputSystem.Utilities;
 using UnityEngine;
 using UnityEngine.InputSystem.Layouts;
+using UnityEngine.InputSystem.LowLevel;
 
 public struct MyDeviceState : IInputStateTypeInfo
 {
@@ -13,14 +14,10 @@ public struct MyDeviceState : IInputStateTypeInfo
     [InputControl(layout = "Axis")]
     public float axis1;
 
-    public FourCC format
-    {
-        get { return new FourCC('M', 'Y', 'D', 'V'); }
-    }
+    public FourCC format => new FourCC('M', 'Y', 'D', 'V');
 }
 
 [InputControlLayout(stateType = typeof(MyDeviceState))]
-//[InputPlugin]
 public class MyDevice : InputDevice, IInputUpdateCallbackReceiver
 {
     public ButtonControl button1 { get; private set; }
@@ -33,16 +30,13 @@ protected override void FinishSetup()
         base.FinishSetup();
     }
 
-    public void OnUpdate(InputUpdateType updateType)
+    public void OnUpdate()
     {
-        if (updateType == InputUpdateType.Dynamic)
-        {
-            var isButton1Pressed = Time.frameCount % 100 == 0;
-            if (isButton1Pressed)
-                InputSystem.QueueStateEvent(this, new MyDeviceState {buttons = 1});
-            else
-                InputSystem.QueueStateEvent(this, new MyDeviceState());
-        }
+        var isButton1Pressed = Time.frameCount % 100 == 0;
+        if (isButton1Pressed)
+            InputSystem.QueueStateEvent(this, new MyDeviceState {buttons = 1});
+        else
+            InputSystem.QueueStateEvent(this, new MyDeviceState());
     }
 
     public static void Initialize()

Assets/Demo/SimpleDemo/SimpleController_UsingActionEventQueue.cs

@@ -4,6 +4,7 @@
 using UnityEngine.InputSystem;
 using UnityEngine.InputSystem.Controls;
 using UnityEngine.InputSystem.Layouts;
+using UnityEngine.InputSystem.LowLevel;
 using UnityEngine.InputSystem.Utilities;
 using UnityEngine.InputSystem.Steam;
 #if UNITY_EDITOR

Assets/Demo/SimpleDemo/SimpleController_UsingActionEventQueue.cs.meta

@@ -1,5 +1,6 @@
 using UnityEngine;
 using UnityEngine.InputSystem;
+using UnityEngine.InputSystem.LowLevel;
 using UnityEngine.UI;
 
 ////FIXME: will not work properly when there are multiple keyboards

Assets/Demo/SimpleDevice.cs

@@ -0,0 +1,4 @@
+{
+  "displayName": "On-Screen Controls Sample",
+  "description": "Demonstrates a simple setup for an on-screen joystick."
+}