router: Add potential optimization feature for route search

[RicoAntonioFelix]

Change

• Add noexcept keyword to server::Connection methods to help compiler generate faster code
• Moved Route component to separate file
• Add attribute to Route component to allow potential speedup when going through the 'route vector'
• Refactored server::Router::to_string method

[AndreasAakesson]

Clever stuff 👍