Add support for mavlink versions in findMAVLink.cmake
right now, there is mavlink 1.0 and mavlink 2.0, we should aim to use mavlink 2.0 since it's compatible with mavlink 1.0 and has more features.
right now, there is mavlink 1.0 and mavlink 2.0, we should aim to use mavlink 2.0 since it's compatible with mavlink 1.0 and has more features.