message: Apply Clang formatting to MaterialXFormat
  This changelist applies Clang formatting to the C++ source in MaterialXFormat, providing improvements in coding style consistency.
diff: @@ -20,7 +20,8 @@ namespace MaterialX
  const string MTLX_EXTENSION = "mtlx";
  -namespace {
  +namespace
  +{
  const string XINCLUDE_TAG = "xi:include";
  const string XINCLUDE_NAMESPACE = "xmlns:xi";
  @@ -114,8 +115,7 @@ void elementToXml(ConstElementPtr elem, xml_node& xmlNode, const XmlWriteOptions
  // Write relative include paths in Posix format, and absolute
  // include paths in native format.
  - FilePath::Format includeFormat = includePath.isAbsolute() ?
  - FilePath::FormatNative : FilePath::FormatPosix;
  + FilePath::Format includeFormat = includePath.isAbsolute() ? FilePath::FormatNative : FilePath::FormatPosix;
  includeAttr.set_value(includePath.asString(includeFormat).c_str());
  writtenSourceFiles.insert(sourceUri);
  