Fixed warnings wioth unusd functions

-Used to get an error when a class uses only one of the static fnctions
defined in math/Math.h
-Put these functions in a class instead of namespace
Moved creation of BonusBoxes to PhysicsManager

-PhysicsManager now has a double that holds the speed of BonusBoxes
-Moved function GetRandoBonusBoxType to PhysicsManager
-PhyscsManger will now intialize the variables of BonusBoxes
-Used for both local and remote objects, but does not set pos and
BonusType for remote objects.