add value_ref_* properites #384

Job	Run time
flake8_tests	13s
python2_tests (debian10, extrasettings)	6m 38s
python2_tests (debian10, extraserver)	6m 40s
python3_tests (debian12, extrasettings)	1m 13s
python2_tests (debian10, basicserver)	6m 51s
python3_tests (debian12, extraserver)	6m 35s
python2_tests (debian10, basicsettings)	6m 45s
python3_tests (debian12, basicserver)	6m 35s
python2_tests (debian10, basic)	6m 54s
python3_tests (debian12, basicsettings)	6m 37s
python3_tests (debian12, basic)	6m 37s
python3_tests (debian11, extrasettings)	6m 36s
python3_tests (debian11, extraserver)	6m 38s
python3_tests (debian11, basicserver)	6m 38s
python3_tests (debian11, basicsettings)	6m 37s
python3_tests (debian11, basic)	6m 37s
python3_tests (debian10, extrasettings)	6m 38s
python3_tests (debian10, extraserver)	6m 38s
python3_tests (debian10, basicserver)	6m 37s
python3_tests (debian10, basicsettings)	6m 39s
python3_tests (debian10, basic)	6m 38s
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
	2h 8m 4s

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