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/LibGUI/GShortcut.h

@@ -0,0 +1,42 @@
+#pragma once
+
+#include <AK/AKString.h>
+#include <AK/Traits.h>
+#include <Kernel/KeyCode.h>
+
+class GShortcut {
+public:
+    GShortcut() {}
+    GShortcut(u8 modifiers, KeyCode key)
+        : m_modifiers(modifiers)
+        , m_key(key)
+    {
+    }
+
+    bool is_valid() const { return m_key != KeyCode::Key_Invalid; }
+    u8 modifiers() const { return m_modifiers; }
+    KeyCode key() const { return m_key; }
+    String to_string() const;
+
+    bool operator==(const GShortcut& other) const
+    {
+        return m_modifiers == other.m_modifiers
+            && m_key == other.m_key;
+    }
+
+private:
+    u8 m_modifiers { 0 };
+    KeyCode m_key { KeyCode::Key_Invalid };
+};
+
+namespace AK {
+
+template<>
+struct Traits<GShortcut> : public GenericTraits<GShortcut> {
+    static unsigned hash(const GShortcut& shortcut)
+    {
+        return pair_int_hash(shortcut.modifiers(), shortcut.key());
+    }
+};
+
+}