Improved HL commander - spiral & linear segment

[matejkarasek]

This PR extends the functionality of the HL commander by adding 1) a linear option to the GOTO command and 2) a spiral command.
More details in the corresponding firmware PR: bitcraze/crazyflie-firmware#1410

[ataffanel]

It seems that this PR will make the lib incompatible with previous version of the firmware.

Since the lib is currently not checking for the protocol version and locking connection, it needs to stay compatible with the old message. Either by checking the version and sending the appropriate message (maybe with a warning to update the Crazyflie), or by adding the new message in a new function.

[matejkarasek]

Thanks for the review.
I see, I followed #134 where take_off was replaced by take_off_2...
Will make a new function instead 👌

[matejkarasek]

So I made a new function.
Checking for the protocol version on the firmware side may have been more elegant, however, I have not figured out how to do that...

[knmcguire]

I've just approved the CI run as that hasn't been done yet, so please check if there are any errors there.

Also for the review we'll need to try this out ourselves just to make sure that everything still works, so we will try to do that before the next release.

Yes absolutely, that would be a nice feature. I'm not sure if we have a issue/ticket for the version checking yet. 🤔