Make RazorPage.IUrlHelper a non-public property
* This allows for injection of the property in cshtml files wthout running
in to compilation errors
* Make IUrlHelper a default injected service

Fixes #816
Modify RazorView to be instantiated via TypeActivator

Partial fix for #889
Fixing doc comment in RazorView
Made razor compilation more robust
- Support other kinds of references when compiling razor views
- Cache application references since they can't change throughout the lifetime
of the running application
Added comment about the source of the Covert method
Wrap a long URI
Introducing Activator for ViewComponents.
Adding a functional test for anti forgery.
Introducing ByteArrayModelBinder.
-Checks for ModelType before processing.
-Ignores quotes in ByteArrayModelBinder.
-Unit,functional Tests.
-ModelStateError is set when Covert.FromBase64String(value) throws.
Adding doc comments for ModelBindingContext

Fixes #865
Improve XML comments in `HtmlHelper` and related classes and interfaces
- #847 line 1: copy XML comments from interfaces to extension methods
- lots of wording changes to be more consistent
 - core text split from PR #866, where @rynowak and I hashed out the words
 - to extent possible, reuse words between method descriptions

- add a few missing `<param/>` and `<typeparam/>` elements and fill in empty ones
- display more HTML elements as tags
- use `<c>true|false|null</c>` more often
- add `<remarks/>` describing behaviour of input helpers e.g. `CheckBox()`
- add `<remarks/>` explaining "renders"
- add `<remarks/>` containing example expression names

nits:
- "The expression" -> "An expression"
- make examples for `ObjectToDictionary()` and `AnonymousObjectToHtmlAttributes()` more consistent
- move `<typeparam/>` elements (that existed) after all `<param/>` elements
- explain "checked" attributes better, removing some duplicated words from the `RadioButton[For]()` descriptions
- correct `routeValues` description in `GenerateForm()` comments