Fix rampart and use moveRandomWithin
Fix rampart and use moveRandomWithin

Use Creep.moveRandomWithin(target) to keep the creep within range for
continual upgrading/repairing but also allow random movement.

TooAngel/screeps,Jirajha/screeps,Nevrdid/screeps,stu43005/screeps,TooAngel/screeps,Jirajha/screeps,stu43005/screeps,Nevrdid/screeps