FCollada, ColladaMax, ColladaMaya, FViewer: Bug 225: Added the LINEAR type for splines. Although LINEAR interpolation is a special case of BEZIER or NURBS interpolation, one could save a lot of space/memory by using the line spline type. I added the FCDLinearSpline class in FCollada. Max and Maya can now import lines by first converting them to a Bezier or NURBS representation. I tested the whole thing using Bezier curves generated by Max, changing their type to LINEAR, and comparing the linear result with its convex hull.