message: Added all GLFW mouse buttons in KeyCode.h
diff: @@ -131,10 +131,16 @@ namespace NovelRT::Input {
  MenuKey = GLFW_KEY_MENU,
  - //The next two should only be used when checking MouseEvents
  + //The next members should only be used when checking MouseEvents
  LeftMouseButton = GLFW_MOUSE_BUTTON_LEFT,
  - RightMouseButton = GLFW_MOUSE_BUTTON_RIGHT
  + RightMouseButton = GLFW_MOUSE_BUTTON_RIGHT,
  + MiddleMouseButton = GLFW_MOUSE_BUTTON_MIDDLE,
  + MouseButtonFour = GLFW_MOUSE_BUTTON_4,
  + MouseButtonFive = GLFW_MOUSE_BUTTON_5,
  + MouseButtonSix = GLFW_MOUSE_BUTTON_6,
  + MouseButtonSeven = GLFW_MOUSE_BUTTON_7,
  + MouseButtonEight = GLFW_MOUSE_BUTTON_8,
  };
  }
  