3.0.0 RC1

The first RC of 3.0.0 is out.

Notable BC breaks:

• Library requires PHP 7.0+ version.
• Date-time fields are converted to DateTimeImmutable instances.
• Date-time changes: %dts does not do any timezone modifications (removed simpleStorageTz), read more in documentation and see the usage matrix.
• Connection::ping() does not connect when connection is not connected.

Notable features & changes:

• Connection: added nested transactions & savepoints.
• Connection: added setter for transation isolation level.
• Added %json modifier.
• Added IConnection interface.
• Added factory for SqlProcessor.
• Added SqlSrv driver & MSSQL support.
• Enhanced Tracy's panel - added elapsed time, explain, updated visual design.
• See full commit changelog since 2.1 version.