ravedude should check rust target against selected MCU

[Rahix]

We should safeguard against people accidentally flashing a binary for a different MCU.

User report: #530

[Rahix]

We have to catch two problems:

1. Wrong rust target
2. Wrong MCU-feature selected in the HAL

For the rust target, I guess we can just check the architecture from the ELF.

For the MCU-feature, maybe the HAL should define a static symbol in the ELF which contains the selected MCU?

[brainstorm]

And/or potentially substitute ravedude for this one?:

https://github.com/luqasz/avrisp

As discussed in probe-rs in probe-rs/probe-rs#391

[Rahix]

@brainstorm, I think this is not really related to the topic of this issue. If you want to discuss this, please open a separate issue.