[break] Ubiquity 2.1.5 will be 2.2.0

[jcheron]

The next version of ubiquity will introduce some breaking changes.

Some classes have been relocated.

• CodeUtils->Ubiquity\utils\base\CodeUtils
• HasModelViewerInterface->Ubiquity\controllers\crud\interfaces\HasModelViewerInterface
• ModelViewer->Ubiquity\controllers\crud\viewers\ModelViewer

The webtools will no longer be part of the main repository but will be in their own repository:
phpmv/ubiquity-webtools

The purpose of this separation is to optimize Composer autoloading. In production, webtools are not necessarily useful.

This version will therefore be a minor version 2.2.0 and not a patch version 2.1.5.

[jcheron]

Version 2.2.0 is released, including the Maintenance section (see #49).
Consider updating the devtools to migrate:
If they are installed globally:
composer global update

See the CHANGLOG file for changes