Quote collation on MySQL

Phpstan fix backport

Updated PHPStan to v0.11.15

Refactor usage of MockBuilder's deprecated setMethods()

Marked connection exception test incomplete on MySQL 8

Fix Appveyor builds

Support for comments on table in all databases

Fix typo in docblock

Using command line options to configure MySQL 8 instead of mounting a config file

Fixed test failures on PHP 7.4

The failures are caused by the changes in PHP according to https://wiki.php.net/rfc/notice-for-non-valid-array-container.

Bumped PHPUnit requrement to ^8.3.3, removed dependency on symfony/phpunit-bridge

Switched from ibmcom/db2express-c to ibmcom/db2

Change "we're" to "where" in docblock for listTableColumns()
method. Add comma to improve readability.

Add commit result bool

Compare type class when comparing columns.

Added a unit test for Doctrine\DBAL\Logging\LoggerChain

Reworked the mocks generated by Prophecy using PHPUnit

Updated PHPUnit to 8.2.1

The new version contains some improvements in handling mocks (https://github.com/sebastianbergmann/phpunit/issues/3602) and will help identify some existing issues in DBAL 3.0 tests:

There were 2 warnings:

1) Doctrine\Tests\DBAL\Driver\OCI8\OCI8StatementTest::testExecute with data set #0 (array('test', null, 'value'))
Method bindValue may not return value of type boolean

2) Doctrine\Tests\DBAL\Driver\OCI8\OCI8StatementTest::testExecute with data set #1 (array(null, 'test', 'value'))
Method bindValue may not return value of type boolean

Updated Jetbrains PhpStorm stubs to 2019.1

Deprecated some unused code bits