[vdmkenny]

The front end's own screens and the in-game menus drew their pointer inside their own drawing, before the scripts drew over the screen. So a script that drew where the pointer was covered it. The rooms and a mod's screen already drew theirs after the scripts.

• The 11 screens leave the pointer out (main menu, game options, settings, mods, mod options, GET MODS, game modes, pilot roster, saved games, in-game options, restart).
• Each driver draws it after the scripts' drawing, through canvas.Canvas.drawPointer:
  • the front end, for each screen it shows (Interface.drawPointer);
  • the rooms' driver, for the menus over the rooms;
  • flight, for the pause menu (PauseMenu.drawPointer).
• The restart screen keeps its pointer at the screen's brightness, and hides it once a choice is made (Restart.drawPointer).
• The pause menu now frees the settings screen it leaves on the next frame, so the frame that leaves it can still draw its pointer.
• With the developers' keys on, the main menu's mission number now goes under the pointer: marked as an improvement.

Checked with the tests, and a new test that the restart screen's pointer stops once a choice is made.

Closes #1171