New singleplayer campaign release

As Armageddon Man wrote a little background I just felt that OA's singleplayer experience is not an exciting one.

The new singleplayer.pk3 file replaces all tiers with theme matched compositions. Bots are easier and increase in challenging skills as you progress through the tiers. There is a 'tourney' boss fight at the end of each.

As the first editing is done a little testing would be appreciated. The final battle is still missing.

Happy fraggin'