LuaSynced*:
  add Spring.SetFeatureBlocking(number featureID, boolean blocking, boolean collidable) --> boolean
  deprecate the Spring.SetProjectileSpin* functions
  add Spring.SetPieceProjectileParams(number projectileID,
    [ number explosionFlags, [ number spinAngle, [ number spinSpeed,
    [ number spinVector.x, [ number spinVector.y, [ number spinVector.z ]]]]]]) --> nil
  add Spring.GetFeatureBlocking(number featureID) --> boolean collidable, boolean crushable, boolean blocking
  add third return-value to Spring.GetUnitBlocking (signature is the same as that of GetFeatureBlocking)