Use httplib to get CCAMS working on Linux (via Wine)

[herver]

CCAMS was failing to do any HTTP call (right from the start at https://github.com/kusterjs/CCAMS/blob/2.3.1/Helpers.cpp#L12-L16) when using with Euroscope on Linux via Wine, probably because of incompatiblity with Wine's WinInet.h

In order to fix this, I have replaced WinInet usage with httplib and brought in also openssl in order to support SSL/TLS, this increases the DLL size quite a lot unfortunately.

In order to bring in httplib and openssl in an easy way, I have added these external dependencies using vcpkg

I hope this PR can be useful, as this was (for me at least) the last missing link to properly do ATC from Linux (and still be compatible with Windows) 😄

[pierr3]

This would be very useful for us on non windows platforms!

[kusterjs]

Thank you for your contribution! I will test it a bit before a release.
Maybe I'll release this as a separate version for those using Wine. Still need to think how important the file size is.

[herver]

Thank you !
Indeed, the DLL will now embed OpenSSL and httplib, here it makes the plugin reach ~3.2MB (which is really big I have to admit )