API: Deprecate SS_Datetime.
The DBField subclasses are have all been renamed to start with “DB” and
be in the SilverStripe\Model\FieldType namespace. To keep DataObject
definitions concise, the original short variations of their names are
preserved as service definitions. Most of the field generation code
doesn’t need to change, but where field classes are referenced directly,
changes will be needed.
SS_Datetime, which is commonly referenced outside the model system
itself, has been preserved as a subclass of DBDatetime. This has been
marked as deprecated and can be removed in SilverStripe 5.
A few places that referred to $db and $casting values weren’t using
the Injector to instantiate the relevant classes. This meant that the
remapping we have created as part of moving classes into a namespace
didn’t work.
I've decoupled `Cookie` from the actual act of setting and getting
cookies. Currently there are a few limitations to how Cookie works that
this change mitigates:
0. `Cookie` currently changes the super global `$_COOKIE` when setting
to make the state of an application a bit more managable, but this is
bad because we shouldn't be modifying super globals
0. One can't actually change the `$cookie_class` once the
`Cookie::$inst` has been instantiated
0. One can't test cookies as there is no class that holds the state of
the cookies (it's just held in the super global which is reset as part
of `Director::test()`
0. One can't tell the origin of a cookie (eg: did the application set it
and it needs to be sent, or did we receive it from the browser?)
0. `time()` was used, so testing was made difficult
0. There was no way to get all the cookies at once (without accessing
the super global)
Todos are on the phpdoc and I'd like to write some tests for the backend
as well as update the docs (if there are any) around cookies.
DOCS Adding `Cookie` docs
Explains basic usage of `Cookie` as well as how the `Cookie_Backend`
controls the setting and getting of cookies and manages state of sent vs
received cookies
Fixing `Cookie` usage
`Cookie` is being used inconsistently with the API throughout framework.
Either by not using `force_expiry` to expire cookies or setting them to
null and then expiring them (which is redundant).
NEW `Director::test()` takes `Cookie_Backend` rather than `array` for `$cookies` param
