Ladybird: Rename classes ending with Ladybird

Now that all the classes for Ladybird are in the Ladybird namespace, we
don't need them named as Ladybird::FooBarLadybird. For the Qt-specific
classes, we can tack on a Qt at the end for clarity, but FontPlugin and
ImageCodecPlugin no longer have anything to do with Qt.

Ladybird/FontPlugin.h

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/RefPtr.h>
+#include <AK/Vector.h>
+#include <LibWeb/Platform/FontPlugin.h>
+
+namespace Ladybird {
+
+class FontPlugin final : public Web::Platform::FontPlugin {
+public:
+    FontPlugin(bool is_layout_test_mode);
+    virtual ~FontPlugin();
+
+    virtual Gfx::Font& default_font() override;
+    virtual Gfx::Font& default_fixed_width_font() override;
+    virtual DeprecatedString generic_font_name(Web::Platform::GenericFont) override;
+
+    void update_generic_fonts();
+
+private:
+    Vector<DeprecatedString> m_generic_font_names;
+    RefPtr<Gfx::Font> m_default_font;
+    RefPtr<Gfx::Font> m_default_fixed_width_font;
+    bool m_is_layout_test_mode { false };
+};
+
+}