A series of small buffs to Enforcer to make it more usable as an anti-unit bombardment ship.

10% turn rate buff.
10% fire rate buff.
5% range buff (660->690)

Halved flight time so it will not overshoot as much when aiming at aircraft or gunships. Still is more than enough for normal use.
Merge branch 'master' of https://github.com/ZeroK-RTS/Zero-K
Further defined crusader as artillery with slower speed, slower projectile, and longer range.
Merge pull request #114 from RyMarq/master

A series of small buffs to Enforcer