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/LibHTML/Layout/LayoutText.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include <LibHTML/Layout/LayoutNode.h>
+#include <LibHTML/DOM/Text.h>
+
+class LayoutText : public LayoutNode {
+public:
+    LayoutText(const Text&, const StyledNode&);
+    virtual ~LayoutText() override;
+
+    const Text& node() const { return static_cast<const Text&>(*LayoutNode::node()); }
+
+    const String& text() const;
+
+    virtual const char* class_name() const override { return "LayoutText"; }
+    virtual bool is_text() const final { return true; }
+    virtual void layout() override;
+
+    struct Run {
+        Point pos;
+        String text;
+    };
+
+    const Vector<Run>& runs() const { return m_runs; }
+
+private:
+    void compute_runs();
+
+    Vector<Run> m_runs;
+};