General Bugfix and missile feature addition work

1)Contacts should be ready for missiles now, though I understand that
all such code will be refactored at some point.
2)Ammo Percent displays correctly now in the TaskGroup Screen.
3)A nasty TaskGroupTN linked list sorting error was resolved.
4)A display issue with range of missiles with no engine or fuel is
resolved.
5)Reloads now decrement missiles properly