Add position(force)

This argument forces the textbox position, meaning it won't be moved
to be inside of the bounds of the screen (nor have the 10 pixel padding
on each side.)

desktop_version/src/Script.h

@@ -122,6 +122,7 @@ public:
     int textboxtimer;
     std::vector<TextboxSprite> textbox_sprites;
     TextboxImage textbox_image;
+    bool textbox_forcepos;
 
     //Misc
     int i, j, k;