Scripts with type="application/json" or "text/plain" are not executed, so we can
use them to inject dynamic CSRF data, without allowing inline-script execution
in Content-Security-Policy.
* View suffix already set by initializer
* Add 'name' and 'description' attributes to ViewSet
ViewSets may now provide their `name` and `description` attributes
directly, instead of relying on view introspection to derive them.
These attributes may also be provided with the view's initkwargs.
The ViewSet `name` and `suffix` initkwargs are mutually exclusive.
The `action` decorator now provides the `name` and `description` to
the view's initkwargs. By default, these values are derived from the
method name and its docstring. The `name` may be overridden by providing
it as an argument to the decorator.
The `get_view_name` and `get_view_description` hooks now provide the
view instance to the handler, instead of the view class. The default
implementations of these handlers now respect the `name`/`description`.
* Add 'extra actions' to ViewSet & browsable APIs
* Update simple router tests
Removed old test logic around link/action decorators from `v2.3`. Also
simplified the test by making the results explicit instead of computed.
* Add method mapping to ViewSet actions
* Document extra action method mapping
Instead of hardcoding the CSRF cookie name, the value is passed to the template as a context variable, rendered as a JavaScript variable, and read by csrf.js.
Fixes#4048
