Add skeleton of TextRenderer

Signed-off-by: Slendi <slendi@socopon.com>

src/App.hpp

@@ -1,6 +1,5 @@
 #pragma once
 
-#include <memory_resource>
 #include <unordered_set>
 #include <vector>
 
@@ -18,6 +17,7 @@ extern "C" {
 #include <wayland-egl.h>
 #include <xkbcommon/xkbcommon.h>
 
+#include "TextRenderer.hpp"
 #include "Theme.hpp"
 #include "common.hpp"
 
@@ -139,6 +139,9 @@ private:
 		}
 	} m_kbd;
 
+	std::optional<TextRenderer> m_tr { std::nullopt };
+	FontHandle m_font;
+
 	enum_array<Theme, ColorScheme> m_themes { make_default_themes() };
 	Theme m_active_theme { Theme::Light };