Remove the T4MVC package.

Don't pull the package in via NuGet any more.
Delete the T4MVC files.

Remove the files, including the generated artefacts, from the project
file and the repository.
Fix the AccountController.

Replace a generated route helper with the magic strings.
Fix the Admin Index view.

There appears to be an ambiguous reference between the two Sessions
Index actions (Admin Area vs. actual site). Not currently sure how to
resolve this.
Fix the Home Page view.
Fix the Session Details partial view.
Fix the Session Details view.
Fix the Login partial view.
Fix the site Layout page.
Fix an HTML5 validation error in the Layout page.
Fix the Speaker Details partial view.
Fix the AdminHome controller.
Fix the admin Role controller.
Fix the admin Session controller.
Fix the admin User controller.
Fix the Account controller.
Fix the Banner controller.
Fix the Home controller.
Fix the Profile controller.
Fix the Session controller.