FIX: PlayerInputManager joining not working with kb&mouse schemes (#1023).

Assets/Samples/SimpleMultiplayer/.sample.json

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+{
+  "displayName": "Simple Multiplayer",
+  "description": "Demonstrates how to set up a simple local multiplayer scenario."
+} 

Assets/Samples/SimpleMultiplayer/Player.prefab

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Assets/Samples/SimpleMultiplayer/README.md

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+# Simple Multiplayer Demo
+
+This demo shows a simple local multiplayer setup. Players can join by pressing buttons on the supported devices. As players join, the screen is subdivided in split-screen fashion.
+
+Joining is handled by the `PlayerManager` GameObject in the scene which has the `PlayerInputManager` component added to it. The component references [`Player.prefab`](./Player.prefab) which is instantiated for each player that joins the game.
+
+The prefab contains a GameObject that has a `PlayerInput` component added to it. The component references the [actions](./SimpleMultiplayerControls.inputactions) available to each player which, by means of the control schemes defined in the asset, also determine the devices (and combinations of devices) supported by the game.
+
+The actions available to each player are intentionally kept simple for this demonstration in order to not add irrelevant details. The only action available to players is `Teleport` which players can trigger through a button on their device. When trigger, they will be teleported to a random position within the game area. This serves to demonstrate that player inputs are indeed separate.
+
+Note that each `PlayerInput` also references a `Camera` which is specific to each player. This is used by `PlayerInputManager` to configure the split-screen setup.

Assets/Samples/SimpleMultiplayer/SimpleMultiplayerControls.inputactions

@@ -0,0 +1,138 @@
+{
+    "name": "SimpleMultiplayerControls",
+    "maps": [
+        {
+            "name": "Player",
+            "id": "fb8d6404-ed77-4dcb-9196-b47c736924a7",
+            "actions": [
+                {
+                    "name": "Teleport",
+                    "type": "Button",
+                    "id": "da5efce7-0b41-45bb-9a3c-2c57823845bf",
+                    "expectedControlType": "Button",
+                    "processors": "",
+                    "interactions": ""
+                }
+            ],
+            "bindings": [
+                {
+                    "name": "",
+                    "id": "143bb1cd-cc10-4eca-a2f0-a3664166fe91",
+                    "path": "<Gamepad>/rightTrigger",
+                    "interactions": "",
+                    "processors": "",
+                    "groups": ";Gamepad",
+                    "action": "Teleport",
+                    "isComposite": false,
+                    "isPartOfComposite": false
+                },
+                {
+                    "name": "",
+                    "id": "05f6913d-c316-48b2-a6bb-e225f14c7960",
+                    "path": "<Mouse>/leftButton",
+                    "interactions": "",
+                    "processors": "",
+                    "groups": ";Keyboard&Mouse",
+                    "action": "Teleport",
+                    "isComposite": false,
+                    "isPartOfComposite": false
+                },
+                {
+                    "name": "",
+                    "id": "886e731e-7071-4ae4-95c0-e61739dad6fd",
+                    "path": "<Touchscreen>/primaryTouch/tap",
+                    "interactions": "",
+                    "processors": "",
+                    "groups": ";Touch",
+                    "action": "Teleport",
+                    "isComposite": false,
+                    "isPartOfComposite": false
+                },
+                {
+                    "name": "",
+                    "id": "ee3d0cd2-254e-47a7-a8cb-bc94d9658c54",
+                    "path": "<Joystick>/trigger",
+                    "interactions": "",
+                    "processors": "",
+                    "groups": "Joystick",
+                    "action": "Teleport",
+                    "isComposite": false,
+                    "isPartOfComposite": false
+                },
+                {
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+                    "id": "8255d333-5683-4943-a58a-ccb207ff1dce",
+                    "path": "<XRController>/{PrimaryAction}",
+                    "interactions": "",
+                    "processors": "",
+                    "groups": "XR",
+                    "action": "Teleport",
+                    "isComposite": false,
+                    "isPartOfComposite": false
+                }
+            ]
+        }
+    ],
+    "controlSchemes": [
+        {
+            "name": "Keyboard&Mouse",
+            "bindingGroup": "Keyboard&Mouse",
+            "devices": [
+                {
+                    "devicePath": "<Keyboard>",
+                    "isOptional": false,
+                    "isOR": false
+                },
+                {
+                    "devicePath": "<Mouse>",
+                    "isOptional": false,
+                    "isOR": false
+                }
+            ]
+        },
+        {
+            "name": "Gamepad",
+            "bindingGroup": "Gamepad",
+            "devices": [
+                {
+                    "devicePath": "<Gamepad>",
+                    "isOptional": false,
+                    "isOR": false
+                }
+            ]
+        },
+        {
+            "name": "Touch",
+            "bindingGroup": "Touch",
+            "devices": [
+                {
+                    "devicePath": "<Touchscreen>",
+                    "isOptional": false,
+                    "isOR": false
+                }
+            ]
+        },
+        {
+            "name": "Joystick",
+            "bindingGroup": "Joystick",
+            "devices": [
+                {
+                    "devicePath": "<Joystick>",
+                    "isOptional": false,
+                    "isOR": false
+                }
+            ]
+        },
+        {
+            "name": "XR",
+            "bindingGroup": "XR",
+            "devices": [
+                {
+                    "devicePath": "<XRController>",
+                    "isOptional": false,
+                    "isOR": false
+                }
+            ]
+        }
+    ]
+}