Add HTTPS support for API

[hdznrrd]

This will allow uses to build HTTP<>HTTPS proxies or even try to implement HTTPS support directly on the embedded platform (not sure if the latter will work, though).

[ubergesundheit]

@mpfeil @chk1 look at https://caddyserver.com/ It makes it really easy to obtain a valid ssl cert from letsencrypt Example Configuration:

opensensemap.org {
  root /var/www/
  browse
  tls your@email.org
}

[chk1]

https is not suppored on (most?) Arduino network attachments, but we should add it nonetheless

We will be switching servers soon and will add https, thanks for the reminder

@ubergesundheit will look into it

[chk1]

HTTPS added to server

Support on website implemented but not yet deployed, coming soon