Revert tinygl_text API and add tinygl_draw_message

apps/ir_grab1/ir_grab1.c

@@ -85,7 +85,7 @@ static void show_char (char ch)
 
     buffer[0] = ch;
     buffer[1] = 0;
-    tinygl_text (buffer, tinygl_point (0, 0));
+    tinygl_text (buffer);
 }