3.0.0 RC1

This is prerelease RC 1 of major 3.0.0 version.

What's new from 2.2 branch:

• PHP 7.0+ code; added types, fixed support for PHP 7.2;
• model: added IModel::clear() method;
• model: added IModel::refreshAll() method;
• collection: added OR operator support;
• collection: added custom functions allowing advanced modification of ICollection;
• entity: added DateTimeImmutable support;
• dropped support for DateTime (BC break!);
• entity: fixed a lot of issues between relationships, their caching, and persistence;
• added MS SQL support;

We have introduced many small and some larger BC breaks, read Upgrade notes for 3.0.

See full commit changelog.