0030953: Data Exchange - implement export of mesh data into glTF 2.0 format

Added new class RWGltf_CafWriter for exporting XCAF document into glTF file
as well as Draw Harness command WriteGltf.

Added auxiliary method OSD_Path::FileNameAndExtension() splitting file name into Name and Extension.

src/RWGltf/RWGltf_WriterTrsfFormat.hxx

@@ -0,0 +1,26 @@
+// Copyright (c) 2017-2019 OPEN CASCADE SAS
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement.
+
+#ifndef _RWGltf_WriterTrsfFormat_HeaderFile
+#define _RWGltf_WriterTrsfFormat_HeaderFile
+
+//! Transformation format.
+enum RWGltf_WriterTrsfFormat
+{
+  RWGltf_WriterTrsfFormat_Compact = 0, //!< automatically choose most compact representation between Mat4 and TRS
+  RWGltf_WriterTrsfFormat_Mat4    = 1, //!< 4x4 transformation Matrix
+  RWGltf_WriterTrsfFormat_TRS     = 2, //!< transformation decomposed into Translation vector, Rotation quaternion and Scale factor (T * R * S)
+};
+enum { RWGltf_WriterTrsfFormat_LOWER = 0, RWGltf_WriterTrsfFormat_UPPER = RWGltf_WriterTrsfFormat_TRS }; // aliases
+
+#endif // _RWGltf_WriterTrsfFormat_HeaderFile