BuildSystem: Move all userpace libraries under the userspace directory

As the number of libraries is increasing, root directory starts to
expand. This adds better organization for libraries

userspace/libraries/LibInput/include/LibInput/MouseEvent.h

@@ -0,0 +1,48 @@
+#pragma once
+
+#include <stdint.h>
+
+namespace LibInput
+{
+
+	enum class MouseButton
+	{
+		Left, Right, Middle, Extra1, Extra2
+	};
+
+	struct MouseButtonEvent
+	{
+		MouseButton button;
+		bool pressed;
+	};
+
+	struct MouseMoveEvent
+	{
+		int32_t rel_x;
+		int32_t rel_y;
+	};
+
+	struct MouseScrollEvent
+	{
+		int32_t scroll;
+	};
+
+	enum class MouseEventType
+	{
+		MouseButtonEvent,
+		MouseMoveEvent,
+		MouseScrollEvent,
+	};
+
+	struct MouseEvent
+	{
+		MouseEventType type;
+		union
+		{
+			MouseButtonEvent button_event;
+			MouseMoveEvent move_event;
+			MouseScrollEvent scroll_event;
+		};
+	};
+
+}