HID SharedMem Rework (#1003)

* Delete old HLE.Input

* Add new HLE Input.

git shows Hid.cs as modified because of the same name. It is new.

* Change HID Service

* Change Ryujinx UI to reflect new Input

* Add basic ControllerApplet

* Add DebugPad

Should fix Kirby Star Allies

* Address Ac_K's comments

* Moved all of HLE.Input to Services.Hid
* Separated all structs and enums each to a file
* Removed vars
* Made some naming changes to align with switchbrew
* Added official joycon colors

As an aside, fixed a mistake in touchscreen headers and added checks to
important SharedMem structs at init time.

* Further address Ac_K's comments

* Addressed gdkchan's and some more Ac_K's comments

* Address AcK's review comments

* Address AcK's second review comments

* Replace missed Marshal.SizeOf and address gdkchan's comments

Ryujinx.HLE/HOS/Applets/Controller/ControllerApplet.cs

@@ -0,0 +1,114 @@
+using System;
+using System.IO;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using Ryujinx.Common.Logging;
+using Ryujinx.HLE.HOS.Services.Hid;
+using Ryujinx.HLE.HOS.Services.Am.AppletAE;
+
+using static Ryujinx.HLE.HOS.Services.Hid.HidServer.HidUtils;
+
+namespace Ryujinx.HLE.HOS.Applets
+{
+    internal class ControllerApplet : IApplet
+    {
+        private Horizon _system;
+
+        private AppletSession _normalSession;
+
+        public event EventHandler AppletStateChanged;
+
+        public ControllerApplet(Horizon system)
+        {
+            _system = system;
+        }
+
+        unsafe public ResultCode Start(AppletSession normalSession,
+                                       AppletSession interactiveSession)
+        {
+            _normalSession = normalSession;
+
+            byte[] launchParams = _normalSession.Pop();
+            byte[] controllerSupportArgPrivate = _normalSession.Pop();
+            ControllerSupportArgPrivate privateArg = IApplet.ReadStruct<ControllerSupportArgPrivate>(controllerSupportArgPrivate);
+
+            Logger.PrintStub(LogClass.ServiceHid, $"ControllerApplet ArgPriv {privateArg.PrivateSize} {privateArg.ArgSize} {privateArg.Mode}" +
+                        $"HoldType:{(NpadJoyHoldType)privateArg.NpadJoyHoldType} StyleSets:{(ControllerType)privateArg.NpadStyleSet}");
+
+            if (privateArg.Mode != ControllerSupportMode.ShowControllerSupport)
+            {
+                _normalSession.Push(BuildResponse()); // Dummy response for other modes
+                AppletStateChanged?.Invoke(this, null);
+
+                return ResultCode.Success;
+            }
+
+            byte[] controllerSupportArg = _normalSession.Pop();
+
+            ControllerSupportArgHeader argHeader;
+
+            if (privateArg.ArgSize == Marshal.SizeOf<ControllerSupportArg>())
+            {
+                ControllerSupportArg arg = IApplet.ReadStruct<ControllerSupportArg>(controllerSupportArg);
+                argHeader = arg.Header;
+                // Read enable text here?
+            }
+            else
+            {
+                Logger.PrintStub(LogClass.ServiceHid, $"Unknown revision of ControllerSupportArg.");
+
+                argHeader = IApplet.ReadStruct<ControllerSupportArgHeader>(controllerSupportArg); // Read just the header
+            }
+
+            Logger.PrintStub(LogClass.ServiceHid, $"ControllerApplet Arg {argHeader.PlayerCountMin} {argHeader.PlayerCountMax} {argHeader.EnableTakeOverConnection} {argHeader.EnableSingleMode}");
+
+            // Currently, the only purpose of this applet is to help 
+            // choose the primary input controller for the game
+            // TODO: Ideally should hook back to HID.Controller. When applet is called, can choose appropriate controller and attach to appropriate id.
+            if (argHeader.PlayerCountMin > 1)
+            {
+                Logger.PrintWarning(LogClass.ServiceHid, "More than one controller was requested.");
+            }
+
+            ControllerSupportResultInfo result = new ControllerSupportResultInfo
+            {
+                PlayerCount = 1,
+                SelectedId = (uint)GetNpadIdTypeFromIndex(_system.Device.Hid.Npads.PrimaryController)
+            };
+
+            Logger.PrintStub(LogClass.ServiceHid, $"ControllerApplet ReturnResult {result.PlayerCount} {result.SelectedId}");
+
+            _normalSession.Push(BuildResponse(result));
+            AppletStateChanged?.Invoke(this, null);
+
+            return ResultCode.Success;
+        }
+
+        public ResultCode GetResult()
+        {
+            return ResultCode.Success;
+        }
+
+        private byte[] BuildResponse(ControllerSupportResultInfo result)
+        {
+            using (MemoryStream stream = new MemoryStream())
+            using (BinaryWriter writer = new BinaryWriter(stream))
+            {
+                writer.Write(MemoryMarshal.AsBytes(MemoryMarshal.CreateReadOnlySpan(ref result, Unsafe.SizeOf<ControllerSupportResultInfo>())));
+
+                return stream.ToArray();
+            }
+        }
+
+        private byte[] BuildResponse()
+        {
+            using (MemoryStream stream = new MemoryStream())
+            using (BinaryWriter writer = new BinaryWriter(stream))
+            {
+                writer.Write((ulong)ResultCode.Success);
+
+                return stream.ToArray();
+            }
+        }
+    }
+}