upgrade phalcon 3.4 to 4.0

codeception.yml

composer.json

src/Model.php

src/Model/Archivable.php

src/Model/Timestampable.php

src/ModelInterface.php

src/Schema.php

tests/ArchiveTest.php

tests/ModelTest.php

tests/SchemaTest.php

tests/_bootstrap_phalcon.php

tests/_support/Phalcon/Models.php

tests/_support/Phalcon/Models/MyArchivableTable.php

tests/_support/Phalcon/Models/MyTable.php

tests/_support/Phalcon/Models/OuterSpace.php

tests/_support/Phalcon/Models/SimpleWithKeys.php