In the old days, content.openttd.org and bananas-server.openttd.org
ended up on the same route. But with a recent migration, they do not.
content.openttd.org only serves the custom TCP protocol, and
bananas-server.openttd.org only serves the HTTP(S).
Websockets use HTTPS, and as such, should be routed via the latter.
This means that pressing Refresh button and adding servers manually
now uses TCP.
The master-server and initial scan are still UDP as they will be
replaced by Game Coordinator; no need to change this now.
If we query a server that is too old, show a proper warning to the
user informing him the server is too old.
Emscripten compiles to WASM, which can be loaded via
HTML / JavaScript. This allows you to play OpenTTD inside a
browser.
Co-authored-by: milek7 <me@milek7.pl>
