Build

Add start of nbuild tool. #453

Job	Run time
run-tests	15s
binaries (thumbv6m-none-eabi, 0x0802_0000)	25s
linux-library	27s
binaries (thumbv6m-none-eabi, 0x1002_0000)	27s
windows-library	2m 2s
binaries (thumbv7em-none-eabi, 0x0802_0000)	35s
binaries (thumbv7em-none-eabi, 0x1002_0000)	26s
binaries (thumbv8m.main-none-eabi, 0x0802_0000)	41s
binaries (thumbv8m.main-none-eabi, 0x1002_0000)	26s
prep-release	5s
release	0s
	5m 49s

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