When modules are installed as the webroot,
manifest generation should behave the same way as when they're in a subfolder.
Which means accepting the module folder both with a _config/ folder
and a _config.php file present.
Note that our usage of `$asSingleton` in `get()` is fine. Quote from the PSR:
> Two successive calls to get with the same identifier SHOULD return the same value. However, depending on the implementor design and/or user configuration, different values might be returned, so user SHOULD NOT rely on getting the same value on 2 successive calls.
Regression introduced through https://github.com/silverstripe/silverstripe-framework/issues/6362.
Quote from the RFC:
```
Thus the order of action precedence becomes
action callback
action on the Form
action on the FormRequestHandler
action on any parent controller (if given)
```
* Test databases now include timestamp for easier debugging
* Use classname::class instead of string literal classnames
* Remove DataObject::get_one() from SapphireTest
* More fixes to ICU DB inconsitency for time formatting
* Correctly restore PHPUnits error handler
FIX for #4417: Ensuring ->removeValidation() is defined on instances of Validator. Setup new API for enabling/disabling validation. Documentation and better type handling.
* API Implement InheritedPermission calculator
* API Rename RootPermissions to DefaultPermissionChecker
API Refactor inherited permission fields into InheritedPermissionExtension
API Introduce PermissionChecker interface
* Stop relying on external constants
* Revise getTinyMCEPath method to throw exception when no path can be computed
* Throw exception on no gzip, better admin module check
Right now SapphireTest::objFromFixture() requires a class as the first
argument. This is fine when your fixture file uses classes as the keys,
but if populating a fixture via tables, objFromFixture() won’t work.
This patch lets you specify either the table name or the class name as
the key.
The benefit here is that you can build fixtures as raw inserts, which is
substantially quicker, and is likely to be a useful tool in building
more efficient test suites.
