Upgrade to PHPStan v0.12

Additionally, set the new value and get the old one in one ini_set() call.

By either defining their types or renaming to match parent class (or
interface).

Allowing us to use more advanced checks and have full generic support.

This also adds a baseline file, since we have new violations being
reported but don't want to address them right now.

Ensure the constructor arguments are passed to custom classes

Updated documentation for QueryBuilder::execute() return value type

Make sure that the $types array has the same keys $params

This will allow to omit parameters with unspecified types

Allow add previous exception in ConversionException

Update readme

Add missed end of comment

This branch seems to have been removed.

Use Docker consistently

They are no longer supported by their vendors, but until we do support
them, we should continue testing them.

It seems to be enabled by default.

Hopefully it will work more reliably.

PHP 7.4 has stable versions now.

When a Docker version of the build is available, use it.

Fix broken build

See https://www.postgresql.org/support/versioning/
See https://mariadb.com/kb/en/mariadb-server/

[pg] fix getting table information if search_path contains escaped schema name