Replaced Freedom with Liberty

[Wyqer]

Q	A
Bug fix?	no
New feature?	yes
Needs wipe?	no
Fixed issues	#462

Description:

The USS Freedom carrier is now replaced with the USS Liberty destroyer. All essential markers and and assets are moved to sensible positions on the destroyer and provide a working start point for the campaign. The two little birds in the hangar can be flown out of there, when the Potato 01 helicopter is gone from the aft deck. In a later stage, with a "startbase dialog", there will be a functionality to move the helicopter to the aft deck automatically.
The weapon systems on the destroyer are fully functional and can be accessed via a UAV terminal. Currently the ship artillery and guided missile depot are empty. The basic thought is to provide a kind of "invest X amount of resource or point Y to rearm these powerful weapons" in a later phase.

Content:

• Removed USS Freedom
• Placed down USS Liberty
• Moved all needed markers and assets to the new platform
• Replaced the hull number, ship flag and ship name
• Adjusted the start vehicle spawn code to work with the boat racks etc.

Tested on:

• Local MP Vanilla
• Local MP ACE
• Dedicated MP Vanilla
• Dedicated MP ACE

[veteran29]

lgtm