AP_ICEngine : Fuel pump implementation and cleanup #1054

Job	Run time
build (stm32f7, chibios, 10)	3m 49s
build (stm32h7, chibios, 10)	3m 25s
build (fmuv2-plane, chibios, 10)	1m 45s
build (periph-build, chibios, 10)	4m 46s
build (iofirmware, chibios, 10)	1m 18s
build (CubeOrange-bootloader, chibios, 10)	45s
build (fmuv3-bootloader, chibios, 10)	44s
build (revo-bootloader, chibios, 10)	45s
build (stm32h7-debug, chibios, 10)	2m 24s
build (fmuv3, chibios, 10)	5m 27s
build (revo-mini, chibios, 10)	4m 11s
build (MatekF405-Wing, chibios, 10)	4m 57s
build (CubeOrange-ODID, chibios, 10)	2m 33s
build (CubeRedPrimary-bootloader, chibios, 10)	1m 3s
build (configure-all, chibios, 10)	9m 42s
build (build-options-defaults-test, chibios, 10)	5m 45s
build (signing, chibios, 10)	2m 45s
build (CubeOrange-PPP, chibios, 10)	2m 0s
build (CubeOrange-SOHW, chibios, 10)	1m 58s
build (Pixhawk6X-PPPGW, chibios, 10)	1m 15s
	1h 1m 17s

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