Add support for the Urboot bootloader (#321) #146

Job	Run time
build (ubuntu-latest, examples/arduino-blink)	1m 33s
build (ubuntu-latest, examples/arduino-external-libs)	50s
build (ubuntu-latest, examples/arduino-internal-libs)	35s
build (ubuntu-latest, examples/arduino-own-src_dir)	29s
build (ubuntu-latest, examples/assembly-blink)	21s
build (ubuntu-latest, examples/digitstump-mouse)	22s
build (ubuntu-latest, examples/engduino-magnetometer)	25s
build (ubuntu-latest, examples/native-blink)	23s
build (windows-latest, examples/arduino-blink)	12m 24s
build (windows-latest, examples/arduino-external-libs)	1m 30s
build (windows-latest, examples/arduino-internal-libs)	1m 17s
build (windows-latest, examples/arduino-own-src_dir)	1m 11s
build (windows-latest, examples/assembly-blink)	1m 2s
build (windows-latest, examples/digitstump-mouse)	1m 6s
build (windows-latest, examples/engduino-magnetometer)	1m 7s
build (windows-latest, examples/native-blink)	54s
build (macos-latest, examples/arduino-blink)	4m 13s
build (macos-latest, examples/arduino-external-libs)	1m 3s
build (macos-latest, examples/arduino-internal-libs)	1m 11s
build (macos-latest, examples/arduino-own-src_dir)	43s
build (macos-latest, examples/assembly-blink)	39s
build (macos-latest, examples/digitstump-mouse)	35s
build (macos-latest, examples/engduino-magnetometer)	35s
build (macos-latest, examples/native-blink)	39s
	35m 7s

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