Titanium iOS and Android to add support for TLS 1.3. Support it for Windows when possible.
We should also make sure TLS 1.3 is enabled by default.
- Add a new TLS_VERSION_1_3 constant to Ti.Network module.
- Add support for the new TLS version constant to HTTPClient.tlsVersion property.
Note: Windows UWP does not support TLS 1.3 yet. See also https://docs.microsoft.com/en-us/uwp/api/windows.networking.sockets.socketprotectionlevel