Integrate libmgba into PTGB debug builds

This allows us to log to mgba's logging window.
It will be very useful to debug issues.

But we only allow enabling this for debug builds for license reasons.

source/main.cpp

@@ -16,6 +16,7 @@
 #include "button_menu.h"
 #include "dbg/debug_mode.h"
 #include "dbg/debug_menu.h"
+#include "dbg/ptgb_mgba_print.h"
 #include "dex_handler.h"
 #include "pokedex.h"
 #include "global_frame_controller.h"
@@ -91,6 +92,7 @@ void initialization_script(void)
 
 	// Prepare text engine for dialogue
 	init_text_engine();
+	ptgb_mgba_init();
 
 	// Set the random seed
 	rand_set_seed(0x1216);
@@ -99,6 +101,8 @@ void initialization_script(void)
 
 	VBlankIntrWait();
 	REG_DISPCNT &= ~DCNT_BLANK;
+
+	PTGB_MGBA_INFO("Hello from PTGB!");
 };
 
 void game_load_error(void)