use a custom chrono-like type for time #1856

Job	Run time
build-libopenblt-linux	11s
build-libopenblt-macos	1m 48s
build-firmware (hellen72, config/boards/hellen/hellen72, fome_hellen72.ini)	1m 45s
build-firmware (small-can-board, config/boards/hellen/small-can-board, fome_small-can-board.ini)	1m 27s
build-firmware (hellen-nb1, config/boards/hellen/hellen-nb1, fome_hellen-nb1.ini)	1m 41s
build-firmware (hellenNA8_96, config/boards/hellen/hellenNA8_96, fome_hellenNA8_96.ini)	1m 46s
build-firmware (hellenNA6, config/boards/hellen/hellen64_miataNA6_94, fome_hellenNA6.ini)	1m 46s
build-firmware (hellen128, config/boards/hellen/hellen128, fome_hellen128.ini)	1m 38s
build-firmware (mre_f4, config/boards/microrusefi, fome_mre_f4.ini)	1m 38s
build-firmware (mre_f7, config/boards/microrusefi, fome_mre_f7.ini)	1m 43s
build-firmware (proteus_f4, config/boards/proteus, fome_proteus_f4.ini)	1m 40s
build-firmware (proteus_f7, config/boards/proteus, fome_proteus_f7.ini)	1m 44s
build-firmware (proteus_h7, config/boards/proteus, fome_proteus_h7.ini)	1m 38s
build-firmware (stm32f429_nucleo, config/boards/nucleo_f429, fome_stm32f429_nucleo.ini)	1m 43s
build-firmware (f407-discovery, config/boards/f407-discovery, fome_f407-discovery.ini)	1m 45s
build-firmware (core8, config/boards/core8, fome_core8.ini)	1m 41s
build-firmware (core48, config/boards/core48, fome_core48.ini)	1m 44s
build-firmware (atlas, config/boards/atlas, fome_atlas.ini)	1m 43s
	29m 1s

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