Implement Go command

[andrewteta]

I would like to be able to execute the program after flashing without power cycling the device. I believe this is possible using the "go" command.

[florisla]

The Go command is already implemented internally, it's only the command line options which is missing.

Does it make sense to split this up into two invocations?

stm32loader --write firmware.bin
stm32loader --go 0x08000000

[dbeinder]

I'd prefer if it was possible to add --go as an extra step to a flash call

[florisla]

Coming back to this, I agree we should add the --go argument and it makes sense to execute it as the last step, after erase and write.