Altered loadout of enemy aircraft

Changed tanker airspeed

Fixed 'strategic sites' objective voiceline

Added additional objs, voices, and events

Changed Echo, Alpha, and Bravo group loadouts

Attempted to fix first bomber group path, units will RTB when respective obj is completed

Changed description and cover image again

Changed title and cover image

Removed fail condition from escort obj; bombers tend to fly into ground after strike

Fixed min # interceptors needed to complete escort obj