add value_ref_* properites #386

Job	Run time
flake8_tests	16s
python2_tests (debian10, extrasettings)	6m 53s
python3_tests (debian12, extrasettings)	1s
python2_tests (debian10, extraserver)	4m 46s
python3_tests (debian12, extraserver)	1s
python2_tests (debian10, basicserver)	7m 44s
python3_tests (debian12, basicserver)	1s
python2_tests (debian10, basicsettings)	6m 54s
python3_tests (debian12, basicsettings)	1s
python2_tests (debian10, basic)	7m 57s
python3_tests (debian12, basic)	1s
python3_tests (debian11, extrasettings)	1s
python3_tests (debian11, extraserver)	1s
python3_tests (debian11, basicserver)	1s
python3_tests (debian11, basicsettings)	1s
python3_tests (debian11, basic)	1s
python3_tests (debian10, extrasettings)	4m 6s
python3_tests (debian10, extraserver)	1m 39s
python3_tests (debian10, basicserver)	4m 23s
python3_tests (debian10, basicsettings)	1m 59s
python3_tests (debian10, basic)	4m 18s
python3_tests (ubuntu22.04, extrasettings)	1s
python3_tests (ubuntu22.04, extraserver)	1s
python3_tests (ubuntu22.04, basicserver)	1s
python3_tests (ubuntu22.04, basicsettings)	1s
python3_tests (ubuntu22.04, basic)	1s
python3_tests (ubuntu24.04, extrasettings)	1s
python3_tests (ubuntu24.04, extraserver)	1s
python3_tests (ubuntu24.04, basicserver)	1s
python3_tests (ubuntu24.04, basicsettings)	1s
python3_tests (ubuntu24.04, basic)	1s
	51m 15s

Provide feedback