Log Message:
pugixml: update to 1.9.

Maintenance release. Changes:

    Specification changes:

        xml_document::load(const char*) (deprecated in 1.5) now has deprecated \ 
attribute; use xml_document::load_string instead

        xml_node::select_single_node (deprecated in 1.5) now has deprecated \ 
attribute; use xml_node::select_node instead

    New features:

        Add move semantics support for xml_document and improve move semantics \ 
support for other objects

        CMake build now exports include directories

        CMake build with BUILD_SHARED_LIBS=ON now uses dllexport attribute for MSVC

    XPath improvements:

        Rework parser/evaluator to not rely on exceptional control flow; longjmp \ 
is no longer used when exceptions are disabled

        Improve error messages for certain invalid expressions such as .[1] or (1

        Minor performance improvements

    Compatibility improvements:

        Fix Texas Instruments compiler warnings

        Fix compilation issues with limits.h for some versions of gcc

        Fix compilation issues with Clang/C2

        Fix implicit fallthrough warnings in gcc 7

        Fix unknown attribute directive warnings in gcc 8

        Fix cray++ compiler errors

        Fix unsigned integer overflow errors with -fsanitize=integer

        Fix undefined behavior sanitizer issues in compact mode