cpp: add class methods to Xpath_Ctx
cpp: add class methods to Xpath_Ctx

Signed-off-by: Mislav Novakovic <5678c0d5a488e1fbc1213419c52ed0f667208fac@sartura.hr>

morganzhh/sysrepo,morganzhh/sysrepo,morganzhh/sysrepo,morganzhh/sysrepo,morganzhh/sysrepo,morganzhh/sysrepo,morganzhh/sysrepo