Made destroying the turrets an optional objective. Destroying the turrets still slows down the damage to the avenger, but is no longer necessary to complete the mission.

Added camera panning to the explosive locations, prior to the destruction of the turrets and artillery cannon, so that you can now see the explosions.

-Added new textures to the explosive points on the tanks so that they are more noticable. Thank to dotvhs!

Added correct target icons for explosive devices

-Units are now revealed after planting the explosive

- Attempted to add matinee to display when the explosive is planted (don't think it is working though)
- Ability icon to plant explosive will now disappear once the explosive is planted

Bug fix - turrets were still targetable when enemies were in the blast radius