Mostly dependency updates

x86_64-pc-windows-gnu-udpt.zip
x86_64-unknown-linux-gnu-udpt.tar.gz

• Converted code to be Rust 2018 instead of the previous Rust 2015. This allows the use of async and await from the Future's system.
• Moved from actix-web to warp web framework for the API server.
• API server now provides more details about active torrents.
• UDP server uses tokio as well as the web server.