Various weapon stuff

* Forte's Assault Railgun: higher velocity; accuracy replaced with equal
sprayAngle
* Better vulcan FX; fix barrel rotation
* Phalanx lifetime 7 -> 5; dance removed
Ship Status: Display unit name in tooltip; make unselected stack buttons more transparent
Icon for Happy Trigger
Move feather trail to unit script + CEG
Square off DarkHive button/panel corners