Merge pull request #15 from yuye-liu/master

merge vect and availablevect
optimised bullet a bit, added bullet graphics, added motion streak
Merge branch 'master' of https://github.com/Wu-Hao/Moon3D
added dummy ui, tweaked sizes of aircrafts
smarter missiles, now it only targets enemy it could have a chance to hit
changed missile sound, added bullet hit sound
sin rotationAngle
Merge branch 'master' of https://github.com/Wu-Hao/Moon3D
add angleRotationSmooth