Set Appveyor to use PHP 7.2

Following a working cache example https://github.com/morozov/diff-sniffer-core/blob/master/.appveyor.yml

Test SQL Server 17 on Travis

Testing of MSSQL on Windows with AppVeyor

PHPUnit 7

Documentation: Warn against using object fields in MySQL and MariaDB

Bump CS version to 3.0

Escape LIKE metacharacters

A string is made of characters, an array might contain anything.

[DBAL-2953] Fixed unqualified PDO class name

This should take care of most idiosyncracies.

See
https://stackoverflow.com/questions/1881853/select-without-a-from-clause-in-oracle

array_merge will not work with any iterable

The Mysql family does not seem to like that one.

The docs only talk about 2008 and up, not sure if those should be added
to 2005 too.

It was possible to provide escaping through the second argument but that
was more like a hack.

Inherit table charset/collation from db charset

[CS] A cast statement must be followed by a single space