Support other switch controller types (#487)

* Make controllers modular, support changing controller type

* return readable events

* signal hid events

* fix style

Ryujinx.HLE/Input/HidControllerType.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace Ryujinx.HLE.Input
+{
+    [Flags]
+    public enum HidControllerType
+    {
+        ProController = 1 << 0,
+        Handheld      = 1 << 1,
+        NpadPair      = 1 << 2,
+        NpadLeft      = 1 << 3,
+        NpadRight     = 1 << 4
+    }
+}