fix bugs: assistspam and no attacker target (typo)
tacnukes, fix core assistance stall, etc

- don't defend with siege units (arty, merl)
- turn corcrw into raider with defense fallback
- allow factories to build anything no matter how much assistance they
receive on summon
- make core build corcv like consul because core lacks consuls
- only stockpile and fire tacnukes at large groups of enemies
- register danger of attacking unit when fired upon
- add tacnukes
- seperate bombard targetting and nuke targetting (range check bombard)
- make sure to build *two* advanced cons
raider defense scramble, defenders defend cons

- grab raiders to defend units in danger
- change defense to being only for con units, and buildings in danger
- dont keep attack squads together when they're near their target
getting shot at
- run away to the nearest most turtled turtle
add build plans system, adjust defender behaviour

- add build plan system
- change dont build zones to rectangles to be less cumbersome
- defend threatened positions by moving near first, then issuing patrol
order
- better calculation of when to scramble raiders (count
defendee.scrambleForMe)
dont spam debug data
Merge pull request #26 from zoggop/master

add build plans system, tacnukes, change defender behaviour, fix core bugs