adding restapi url to initial settings and rearranging settings file to a more logical order of elements

updating directories to PSR-4 standard and removing configFactory calls, since that's not a thing any more

replace determination of node path in node_update and node_delete hooks with current_path invocation

update _akamai_get_all_paths function to use redefined url_alias table schema and renamed Language::LANGCODE_NOT_SPECIFIED constant

Issue #2134145 by joelcollinsdc, roshan_shetty, cherrypj: add REST API option in prepartion for Akamai sunsetting SOAP