Add NG+ checkbox for TR1R

[lahm86]

Medipacks can't be used in TR1R NG+, so if the rando allocates one, it's a waste of an item (even attempting to use the item doesn't work). Add a checkbox so the player can say they will be playing in NG+, and in that case, only randomize item types to ammo or weapons.

~~This is for TR1R - double check what happens in TR3. TR2 allows medi use.~~ TR2R and TR3R allow medi use.