Allow `Orchestra\Foundation\Application::group()` to mimick `Route::group()` functionality.

Signed-off-by: crynobone <crynobone@gmail.com>
Update changelog

Signed-off-by: crynobone <crynobone@gmail.com>
Fixes bug with latest changes.

Signed-off-by: crynobone <crynobone@gmail.com>
Merge branch '2.1' into 2.2
Update changelog.

Signed-off-by: crynobone <crynobone@gmail.com>