Added OnRadar True to WW2 planes

Will allow ICBM AA to shoot at them and show up on ICBM radar
Prevented GUI Crash

Stops minecraft crashing if you open a GUI just as your plane is
destroyed
Better ICBM AA compatibility

Does damage to random part not just core, won't target players on
turret's access list
Renamed static field

isICBMLoaded changed to isICBMSentryLoaded
Merge pull request #336 from Mirosta/master

Better ICBM Compatibility and minor bug fixes
Fixed Lancaster Bomb Delay

Changed from 1 (every tick!) to 40 (every 2 seconds)
Added methods for creating EntityBullets

Kind of duplicate methods for creating bullet entities, but can be
overriden to allow sub classes of EntityBullet to be used
Migrated plane to new spawn method

Plane used ItemBullet.getEntity doesn't create a bullet on its own
Migrated mech to new spawn method
Migrated vehicles to new spawn method
Migrated seat weapons to new spawn method
Migrated MG and AA to new spawn method
Migrated hand held guns to new spawn method
Merge pull request #337 from Mirosta/master

Fixed Lancaster Bomb Delay and changed bullet spawning
Missing GUI for gun table

Adds the missing GUI for the gun modification table.
Fixed plane seats sometimes moving erratically

prevLooking copies value of looking at the end of every tick
Merge pull request #338 from Mirosta/master

Fixed plane seats sometimes moving erratically
Fixed some bullet spawning bugs
Merge pull request #339 from Mirosta/master

Fixed some bullet spawning bugs
Added a gunsight Part to the AAGun