Add support for Distance Sensor in ArduPilot

[rajat2004]

Changes -

1. Support for Distance Sensor in ArduPilot, also increase RC channels to 12
2. Fix style inconsistency, use unique_ptr in ArduPilot files
3. Unity: Update to C++14 standard

Win Blocks binary - https://drive.google.com/file/d/1eLaC58nnh0ms9BhHqvVMnXo9o_xiH3pr/view?usp=sharing

TODO:

• ArduRover Implementation
• Documentation in ArduPilot Wiki (AP Wiki PR - Dev: AirSim: Add info about Rangefinder ArduPilot/ardupilot_wiki#2948)

Corresponding AP PR - ArduPilot/ardupilot#15007
Follow-up after #2807

Code duplication, any ideas on how this can be reduced?

Second-last commit fixes a style inconsistency, camel case is not used for variables there, also no idea why I used shared_ptr, maybe a remanent of earlier copy-paste from PX4 backend.
Last one updates C++ standard used in Unity to C++14, required for make_unique (see https://en.cppreference.com/w/cpp/memory/unique_ptr/make_unique), otherwise this happens

However, AirLib is built with C++17 standard in UE, which can cause problems later on. Should it be updated further to 17? (Tested it to be working locally)

[rajat2004]

@madratman @saihv @ironclownfish @jonyMarino Just asking, would it be possible to have the packaged Blocks binary from the Azure Pipelines available to download? Described here https://docs.microsoft.com/en-us/azure/devops/pipelines/artifacts/artifacts-overview?view=azure-devops (I haven't myself gone through it completely)
Also mentioned here - #2866 (comment)

[rajat2004]

@madratman @saihv @ironclownfish @jonyMarino Just asking, would it be possible to have the packaged Blocks binary from the Azure Pipelines available to download? Described here https://docs.microsoft.com/en-us/azure/devops/pipelines/artifacts/artifacts-overview?view=azure-devops (I haven't myself gone through it completely)
Also mentioned here - #2866 (comment)

Just a follow-up, could an API call like this work - https://docs.microsoft.com/en-us/rest/api/azure/devops/build/artifacts/get?view=azure-devops-rest-4.1?
Need to figure out the variables though, and mostly needs access

[rajat2004]

Replaced by #3364