Webapi: Case Insensitive option on ordinary Web API (i.e. ApiController)

[cpwood]

Have just updated to version 6 of the library and have identified that the config.EnableCaseInsensitive(true) option has disappeared.

I've already seen issue #812 with a resolution using MapODataServiceRoute, however I'm actually just using the [EnableQuery] attribute within an ordinary Web Api (i.e. the controller inherits from ApiController and returns an IQueryable).

How can this type of query be made case insensitive in the new version?

[cpwood]

Answering my own question - figured it out!

When enabling dependency injection, include an action. Then use the builder to add your own instance of a ODataUriResolver using dependency injection:

``` c#
config.EnableDependencyInjection(builder =>
{
builder.AddService(ServiceLifetime.Singleton, sp => new CaseInsensitiveResolver());
});

The custom resolver looks like this:

``` c#
        public class CaseInsensitiveResolver : ODataUriResolver
        {
            public override bool EnableCaseInsensitive
            {
                get { return true; }
                set { /* Ignore value */ }
            }
        }