Beam grid types

Variables
const int	Renga::GridTypes::Beam::Undefined = 0
	Undefined.
const int	Renga::GridTypes::Beam::Side = 1
	Side faces of a beam.
const int	Renga::GridTypes::Beam::FirstButt = 2
	The butt where the beam building has been started.
const int	Renga::GridTypes::Beam::SecondButt = 3
	The butt where the beam building has been finished.
const int	Renga::GridTypes::Beam::Cut = 4
	Faces appearing as a result of cutting a beam by other objects.

Possible grid types for a Beam mesh