[Feature request] HTTPS support

[rebane2001]

At the moment this library can only play content from insecure HTTP sources, but it'd be awesome to see it play HTTPS as well since HTTPS-only sources are becoming more and more common.

I got HTTPS to work for myself by using WiFiClientSecure in AudioFileSourceHTTPStream.h and setting the right root ca (or you can do client.setInsecure()) in AudioFileSourceHTTPStream.cpp. I imagine this isn't the best way to go about things, hence the issue and not a PR, but it works great for me.

Perhaps it could also make sense to instead let the user provide their own WiFiClient along the lines of file = new AudioFileSourceHTTPStream(URL, client); so that the user can use their own WiFiClientSecure and root ca instead of delegating this to the audio library.

[positron96]

Huh, so that's why I couldn't play https streams...