Refactor glTFCommon namespace structure

Refactor namespace declarations for consistency.

code/AssetLib/glTFCommon/glTFCommon.cpp

@@ -38,15 +38,11 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 ----------------------------------------------------------------------
 */
-//#ifndef ASSIMP_BUILD_NO_GLTF_IMPORTER
-
 #include "AssetLib/glTFCommon/glTFCommon.h"
 
-namespace glTFCommon {
-
 using namespace glTFCommon::Util;
 
-namespace Util {
+namespace glTFCommon::Util {
 
 bool ParseDataURI(const char *const_uri, size_t uriLen, DataURI &out) {
     if (nullptr == const_uri) {
@@ -111,7 +107,4 @@ bool ParseDataURI(const char *const_uri, size_t uriLen, DataURI &out) {
     return true;
 }
 
-} // namespace Util
-} // namespace glTFCommon
-
-//#endif
+} // namespace glTFCommon::Uti