Feature: Add element and user data to mesh handle #3406

Job	Run time
fine_grained_trigger	11s
t8code_w_shipped_submodules_tests / t8code_cmake_tests	9m 6s
preparation (OFF) / cmake_preparation	1m 53s
preparation (ON) / cmake_preparation	2m 2s
t8code_code_coverage / generate-codecov	35m 20s
sc_p4est_tests (OFF) / sc_p4est_cmake_tests	5m 1s
t8code_api_tests (ON, Debug) / t8code_cmake_tests	9m 0s
t8code_api_tests (ON, Release) / t8code_cmake_tests	8m 49s
t8code_tests (ON, Debug) / t8code_cmake_tests	8m 28s
t8code_tests (ON, Release) / t8code_cmake_tests	8m 17s
sc_p4est_tests (ON) / sc_p4est_cmake_tests	4m 10s
t8code_linkage_tests (ON, Debug) / t8code_cmake_tests	24m 15s
t8code_tests (OFF, Debug) / t8code_cmake_tests	6m 27s
t8code_tests (OFF, Release) / t8code_cmake_tests	6m 36s
t8code_linkage_tests (OFF, Release) / t8code_cmake_tests	17m 19s
t8code_linkage_tests (OFF, Debug) / t8code_cmake_tests	17m 33s
t8code_linkage_tests (ON, Release) / t8code_cmake_tests	22m 49s
t8code_valgrind_tests	0s
t8code_tarball / build	58s
t8code_doxygen_check / update_dev_doc	1m 8s
t8code_tarball / test-tarball	5m 57s
	3h 15m 19s

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