Fix controller support for "Starlancer"

Continuing with my current fixation on Space Sims, here's another classic (or semi classic, at least) that I didn't see on here. It's an oldie but goodie. Again, I went for including a maximum amount of commands on the control pad in an effort to try to eliminate the need for going back and forth to the keyboard or the mouse. I've not played beyond the 2nd level so far but I think I succeeded. Remember you have to set up the in-game menu to "no joystick", to avoid conflicts.

Couple notes.

- Right stick controls roll by pushing the stick left/right, and controlls throttle by pushing the stick up/down. If you've never played a space sim this way before, it may take a little getting used to but it becomes 2nd nature. And by utilizing 4 seperate commands on the right stick alone, it economizes a lot of commands for the buttons.

- Left bumper is the shift key, as always. While holding shift down, the right thumbstick will control the mouse pointer for when you're in the pause menu. Right trigger will activate the left mouse button while in this state.

Any questions, post 'em here. Enjoy!

PS - Working on Freespace 2 next. If anybody wants to help, I'll take all the help I can get for that one!