General review and performance optimization of IOWavefrontOBJ block and its affiliate ManipulateWOBJData block (manipulation of optional Wavefront OBJ format data).
[x] Review of class interface (rational layout of set/get w.r.t. to class functionality)
[x] Investigation on differences and optimization of I/O performances on both Win and Linux OS's.
[x] adding feature of vnormals recomputation on ManipulateWOBJData
General review and performance optimization of IOWavefrontOBJ block and its affiliate ManipulateWOBJData block (manipulation of optional Wavefront OBJ format data).