Telemetry class updates & RPC_Response backward compatibility

[imbeacon]

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[imbeacon]

Hi @MathewHDYT ,

What do you think about these changes?
The main thing for checking is avoiding using ARDUINO_JSON_NAMESPACE.

[MathewHDYT]

Sorry for the delay I had a look at the code and at the failed builds to check what is missing.

@imbeacon I created a pull request onto your fork so you can simply accept that pull request and then they should be merged into this one. It also includes some info on what I changed and why.

[MathewHDYT]

@imbeacon As you can see from the build checks the ESP32 and ESP8266 now compile successfully again even if using the newest version of ArduinoJson.

But that way of discerning between constructors will not work for non C++ STL boards, meaning we need a workaround for those boards.

Because std::integral is in the C++ STL header, which some Arduino boards do not include.

I'll try to find a fix that isn't to complicated if possible, but there is a high likelihood that I need to add my Struct workaround for Arduino boards again.

I'll create a pull request again once I found a way to fix the issue.

Until this has been resolved I wouldn't merge this pull request.

[MathewHDYT]

@imbeacon The pull request has been created and fixes the problems with Arduino without using any complicated struct workarounds.

[MathewHDYT]

@imbeacon Would be nice if this pull request could be merged and released with all changes as version 0.10.0, the library.json has been renamed accordingly already.

Additionaly once this is merged issue 130 can be closed as well.