Copter: support for making use of heading error correction selectable #935

Job	Run time
build (stm32f7, chibios, 10)	8m 50s
build (stm32h7, chibios, 10)	7m 50s
build (fmuv2-plane, chibios, 10)	4m 46s
build (periph-build, chibios, 10)	8m 21s
build (iofirmware, chibios, 10)	3m 32s
build (CubeOrange-bootloader, chibios, 10)	2m 59s
build (fmuv3-bootloader, chibios, 10)	3m 20s
build (revo-bootloader, chibios, 10)	2m 57s
build (stm32h7-debug, chibios, 10)	5m 44s
build (fmuv3, chibios, 10)	10m 41s
build (revo-mini, chibios, 10)	8m 44s
build (MatekF405-Wing, chibios, 10)	9m 5s
build (CubeOrange-ODID, chibios, 10)	6m 41s
build (CubeRedPrimary-bootloader, chibios, 10)	2m 55s
build (configure-all, chibios, 10)	11m 41s
build (build-options-defaults-test, chibios, 10)	11m 54s
build (signing, chibios, 10)	6m 7s
build (CubeOrange-PPP, chibios, 10)	5m 34s
build (CubeOrange-SOHW, chibios, 10)	5m 8s
build (Pixhawk6X-PPPGW, chibios, 10)	3m 27s
	2h 10m 16s

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