Swichable layouts

[wbloszyk]

Subject

This PR will add new layout system. By default it will be off. If someone switch it to on, then next "string $layout" argument will be reachable for the TemplateRegistry.

I am targeting this branch, because this change must be done in 4.x branch.

Closes #8117

Changelog

### Added
- Some `Class::newMethod()` to do great stuff

### Changed

### Deprecated

### Removed

### Fixed

### Security

To do

• [ ] Update the tests
• [ ] Update the documentation
• [ ] Add an upgrade note
• [ ] Add Switcher
• [ ] Add options (with "box_class")