Revert tinygl_text API and add tinygl_draw_message

apps/ir_grab2/ir_grab2.c

@@ -89,7 +89,7 @@ static void show_char (char ch)
 
     buffer[0] = ch;
     buffer[1] = 0;
-    tinygl_text (buffer, tinygl_point (0, TINYGL_HEIGHT - 1));
+    tinygl_text (buffer);
 }
 
 
@@ -99,7 +99,7 @@ static void show_num (char ch, uint8_t num)
 
     buffer[0] = ch;
     uint8toa (num, buffer + 1, 0);
-    tinygl_text (buffer, tinygl_point (0, TINYGL_HEIGHT - 1));
+    tinygl_text (buffer);
 }