Deprecate stuff removed in 3.0

[jwage]

Going to rework the following in to a list of deprecations that are needed for 2.x

BC BREAK: Changes in the Doctrine\DBAL\Event API

• SchemaAlterTableAddColumnEventArgs::addSql() and the same method in other SchemaEventArgs-based classes no longer accept an array of SQL statements. They accept a variadic string.
• ConnectionEventArgs::getDriver(), ::getDatabasePlatform() and ::getSchemaManager() methods have been removed. The connection information can be obtained from the connection which is available via ::getConnection().
• SchemaColumnDefinitionEventArgs::getDatabasePlatform() and SchemaIndexDefinitionEventArgs::getDatabasePlatform() have been removed for the same reason as above.

BC BREAK: Changes in the Doctrine\DBAL\Connection API

• The following methods have been removed as leaking internal implementation details: ::getHost(), ::getPort(), ::getUsername(), ::getPassword().
• The ::getDatabase() method can now return null which means that no database is currently selected.

BC BREAK: Changes in Doctrine\DBAL\Driver\SQLSrv\LastInsertId

• The class stores the last inserted ID as a nullable string, not an integer, which is reflected in the method signatures.

BC BREAK: Changes in the Doctrine\DBAL\Schema API

• Method Doctrine\DBAL\Schema\AbstractSchemaManager::_getPortableViewDefinition() no longer optionally returns false. It will always return a Doctrine\DBAL\Schema\View instance.
• Method Doctrine\DBAL\Schema\Comparator::diffTable() now optionally returns null instead of false.
• Property Doctrine\DBAL\Schema\TableDiff::$newName is now optionally null instead of false.
• Method Doctrine\DBAL\Schema\AbstractSchemaManager::tablesExist() no longer accepts a string. Use Doctrine\DBAL\Schema\AbstractSchemaManager::tableExists() instead.
• Method Doctrine\DBAL\Schema\OracleSchemaManager::createDatabase() no longer accepts null for $database argument.
• Removed unused method Doctrine\DBAL\Schema\AbstractSchemaManager::_getPortableFunctionsList()
• Removed unused method Doctrine\DBAL\Schema\AbstractSchemaManager::_getPortableFunctionDefinition()
• Removed unused method Doctrine\DBAL\Schema\OracleSchemaManager::_getPortableFunctionDefinition()
• Removed unused method Doctrine\DBAL\Schema\SqliteSchemaManager::_getPortableTableIndexDefinition()

BC BREAK: Changes in the Doctrine\DBAL\Driver API

1. The $username and $password arguments of ::connect() are no longer nullable. Use an empty string to indicate empty username or password.
2. The return value of ::getDatabase() has been documented as nullable since some of the drivers allow establishing a connection without selecting a database.

BC BREAK: Doctrine\DBAL\Driver::getName() removed

The Doctrine\DBAL\Driver::getName() has been removed.

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