Libraries: Create top level directory for libraries.

Things were getting a little crowded in the project root, so this patch
moves the Lib*/ directories into Libraries/.

Libraries/LibCore/CEvent.cpp

@@ -0,0 +1,12 @@
+#include <LibCore/CEvent.h>
+#include <LibCore/CObject.h>
+
+CChildEvent::CChildEvent(Type type, CObject& child)
+    : CEvent(type)
+    , m_child(child.make_weak_ptr())
+{
+}
+
+CChildEvent::~CChildEvent()
+{
+}