Revert "Revert "Upgrade Poco to latest stable version, 1.4.7 (lib)""

This reverts commit ea83f5ac73d31999db60c6d04ac5fb733ead82bd.
Revert "Revert "Upgrade poco lib version""

This reverts commit 22d315bf7da4adb9407ccca0f8ab5f5e286541d6.