Change some Info level logs to Debug

This version hides some internal classes and methods like WebSocket and mark with Obsolete attribute classes, methods and properties that will be dropped or replaced in the new major version.

• Global Exception Handler was added as propose issue #300. For example, if you want to remove the default HTML error response, you can add a function to the UnhandledException property at IWebServer:

using (var server = new WebServer(webOptions))
{
    // Report to console the error only
    server.UnhandledException = (ctx, ex, ct) => {
        ex.Message.Error(nameof(WebServer));
        ctx.Response.StatusCode = 500;

        return Task.FromResult(true);
    };

    // Continue with WebServer start up
}

• The MIME Types Dictionary was reverted to plain Dictionary to allow add new entries (Issue #302)

Some extensions methods, properties, and classes are marked as Obsolete because they are no longer part of the next major version of EmbedIO. One important breaking change is we are no longer supporting Wildcard routing so we encourage to change your code to Regex routing.

Also, this version includes a subprotocol selector for WebSocket #285.

Fix issue with SWAN JSON issues updating this dependency.

• Add Items to IHttpContext
• Add virtual methods to WebApiController
• Fix #278 (Thanks @rdeago)

Thanks to @rdeago for the PR #275 (Issue #272).

Remove the WebSocket client and fix several issues.

HTTPS Support

• Support to IPv6 (Issue #214)

You can setup IPv6 in two ways:

Using new EndPointManager.UseIpv6 will set IPAddress.IPv6Any for * hostname:

EndPointManager.UseIpv6 = true;
var instance = new WebServer("http://*:8877");

Or directly using the IPv6 address like the lookback:

var instance = new WebServer("http://[::1]:8877");

• Fix WebSocket client for targets NET47 and NETCOREAPP21
• Remove Task.Delay from polling (Issue #155)
• Add ConfigureAwait(false) to async invocations.

Breaking changes

• WebApiController is renewed. Reduce the methods overhead removing the WebServer and Context arguments. See examples below.
• RoutingStrategy.Regex is the default routing scheme.

Additional changes

• IHttpListener is runtime/platform independent, you can choose Unosquare HttpListener implementation with NET47 or NETSTANDARD20. This separation of implementations brings new access to interfaces from common Http objects like IHttpRequest, IHttpContext and more.
• IWebServer is a new interface to create custom web server implementation, like a Test Web Server where all the operations are in-memory to speed up unit testing. Similar to TestServer from OWIN
• General improvements in how the Unosquare HttpListner is working and code clean-up.

Note - We encourage to upgrade to the newest EmbedIO version. Branch version 1.X will no longer be maintained, and issues will be tested against 2.X and resolved just there.

Add new Resources File Module by @nickhodge.

• Change dependency SWAN to Lite version
• Upgrade codebase to C# 7.1

• Added support for web socket routing #124
• New callback to handle 405 HTTP responses #123