Prepare Font double buffer

Support/src/FontWriter/src/font_writer.cpp

@@ -2,7 +2,24 @@
 #include <stdio.h>
 
 namespace JabyEngine {
-    void FontWriter :: setup(SimpleTIM vram_dst, const FontInfo& font_info) {
+    struct DoubleBuffer {
+        // Hooks?
+        FontBufferInfo prim_buffer;
+
+        static constexpr DoubleBuffer empty() {
+            return DoubleBuffer{.prim_buffer = FontBufferInfo::empty()};
+        }
+
+        void setup(const FontBufferInfo& buffer_info) {
+            this->prim_buffer = buffer_info;
+        }
+    };
+
+    static auto double_buffer = DoubleBuffer::empty();
+
+    void FontWriter :: setup(const FontBufferInfo& buffer_info, SimpleTIM vram_dst, const FontInfo& font_info) {
+        double_buffer.setup(buffer_info);
+        
         printf("Hello Planschi c:\n");
     }
 }