Draft: cxx/satellite/receiver: check for DATA services at launching

Attempt to solve #141, but with issues:

• We only send the CHIRP DATA request in starting, so nothing known at launching stage.
• There is no way to check the CHIRP MD5 hash case-insensitively, so now we get warnings for every data transmitter that has not the correct casing.

We could merge it like it is and change the warning to an exception when we can do proper matching, but this will only come with CHIRP2