MariaDB improvements, support 10.3

revert back MariaDb1027Platform

Remove old comment from MysqliStatement

As discussed in #3217 (see https://github.com/doctrine/dbal/pull/3217#issuecomment-419673323 in particular), there is no way in MySQL to get around the `max_allowed_packet` limitation.

Use behaviuor instead of  behavior

Same as other templates

Ignore case when matching ARRAY

Force Sequence::$initialValue type

Update homepage

Add .doctrine-project.json to root of the project.

Fixed type hints in DockBlocks

As the explanatory description says: "The name or position of the parameter."

Deprecate Doctrine\DBAL\Types\Type::getDefaultLength()

Fix support for URL to account for master-slave and pooling-shard connections

Deprecate Doctrine\DBAL\Types\Type::__toString()

Update export ignores

Throw ConversionException when unserialization fail for array and object types

cs fix

object type

conversionFailedUnserialization

type hinting & finally restore error handler

cs: use function

type hint

sort use alphabetically

code quality improvements

Deprecated usage of the NULL offset in LIMITed queries

Replaced call_user_func_array() of a fixed method with the usage of variadic arguments

Deprecated dbal:import CLI command

2.8 in README & branch alias to 2.9

Use PSR-4 autoloader

Removed NOW() from QueryBuilder usage examples

GitHub template grammar/spelling fixes