SFT-3834: first pass of message signing with microsd option, saved #180

Job	Run time
Tools	7m 10s
Firmware (mono, -founders-passport, -founders)	8m 27s
Firmware (color, -passport)	8m 42s
Bootloader (color)	2m 20s
Simulator (mono)	2m 51s
Simulator (color)	3m 4s
	32m 34s

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