add value_ref_* properites #378

Job	Run time
flake8_tests	15s
python2_tests (debian10, extrasettings)	11m 30s
python2_tests (debian10, extraserver)	11m 30s
python3_tests (debian12, extrasettings)	19s
python2_tests (debian10, basicserver)	11m 32s
python3_tests (debian12, extraserver)	11m 27s
python3_tests (debian12, basicserver)	11m 27s
python2_tests (debian10, basicsettings)	11m 30s
python3_tests (debian12, basicsettings)	11m 29s
python2_tests (debian10, basic)	11m 29s
python3_tests (debian12, basic)	11m 29s
python3_tests (debian11, extrasettings)	11m 28s
python3_tests (debian11, extraserver)	11m 28s
python3_tests (debian11, basicserver)	11m 31s
python3_tests (debian11, basicsettings)	11m 28s
python3_tests (debian11, basic)	11m 30s
python3_tests (debian10, extrasettings)	11m 29s
python3_tests (debian10, extraserver)	11m 30s
python3_tests (debian10, basicserver)	11m 29s
python3_tests (debian10, basicsettings)	11m 29s
python3_tests (debian10, basic)	11m 31s
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
	3h 39m 0s

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