Add ctor to KeyEvent and make readonly struct

src/BizHawk.Bizware.DirectX/IPCKeyInput.cs

@@ -41,7 +41,7 @@ namespace BizHawk.Bizware.DirectX
 						int e = br.ReadInt32();
 						bool pressed = (e & 0x80000000) != 0;
 						lock (PendingEventList)
-							PendingEventList.Add(new KeyEvent { Key = KeyInput.KeyEnumMap[(Key)(e & 0x7FFFFFFF)], Pressed = pressed });
+							PendingEventList.Add(new KeyEvent(KeyInput.KeyEnumMap[(Key) (e & 0x7FFFFFFF)], pressed));
 					}
 				}
 				catch { }

src/BizHawk.Bizware.DirectX/Keyboard.cs

@@ -66,8 +66,8 @@ namespace BizHawk.Bizware.DirectX
 
 					foreach (var e in events)
 					{
-						foreach (var k in e.PressedKeys) eventList.Add(new KeyEvent { Key = Mapped(k), Pressed = true });
-						foreach (var k in e.ReleasedKeys) eventList.Add(new KeyEvent { Key = Mapped(k), Pressed = false });
+						foreach (var k in e.PressedKeys) eventList.Add(new KeyEvent(Mapped(k), pressed: true));
+						foreach (var k in e.ReleasedKeys) eventList.Add(new KeyEvent(Mapped(k), pressed: false));
 					}
 				}
 			}

src/BizHawk.Client.Common/input/KeyEvent.cs

@@ -4,10 +4,16 @@ using OpenTK.Input;
 
 namespace BizHawk.Client.Common
 {
-	public struct KeyEvent
+	public readonly struct KeyEvent
 	{
-		public Key Key;
+		public readonly Key Key;
 
-		public bool Pressed;
+		public readonly bool Pressed;
+
+		public KeyEvent(Key key, bool pressed)
+		{
+			Key = key;
+			Pressed = pressed;
+		}
 	}
 }

src/BizHawk.Client.EmuHawk/Input/OTK_Keyboard.cs

@@ -46,9 +46,9 @@ namespace BizHawk.Client.EmuHawk
 				foreach (var key in KeyList)
 				{
 					if (lastState.IsKeyUp(key) && _kbState.IsKeyDown(key))
-						EventList.Add(new KeyEvent { Key = key, Pressed = true });
+						EventList.Add(new KeyEvent(key, pressed: true));
 					else if (lastState.IsKeyDown(key) && _kbState.IsKeyUp(key))
-						EventList.Add(new KeyEvent { Key = key, Pressed = false });
+						EventList.Add(new KeyEvent(key, pressed: false));
 				}
 			}
 			catch