Update CHANGES and UPGRADE.txt for 18.10.0

CHANGES

doc/CHANGES-staging/ami_wink.txt

doc/CHANGES-staging/app_mf_mf.txt

doc/CHANGES-staging/app_queue_DIALEDPEERNUMBER.txt

doc/CHANGES-staging/app_queue_nordic_language.txt

doc/CHANGES-staging/app_queue_say_thanks.txt

doc/CHANGES-staging/app_sendtext.txt

doc/CHANGES-staging/app_voicemail_danish_syntax.txt

doc/CHANGES-staging/bundled-pjproject-build.txt

doc/CHANGES-staging/cdr_disable.txt

doc/CHANGES-staging/chan_sip_pickup_AST_STATE_DOWN.txt

doc/CHANGES-staging/cli_refresh.txt

doc/CHANGES-staging/func_json.txt

doc/CHANGES-staging/res_fax_spandsp.txt