Remove workaround in PDOSqlsrv\Connection::quote()

respect to platform restrictions when creating autoincrement identifier name

Rework extension detection in tests

Use relative names in inline {@link} annotations where possible

Update Slevomat Coding Standard to 6.3.10

Update PHPStan to 0.12.31

Update PHPStan to 0.12.30

Bump Psalm level to 5

Fix handling host and port configuration in sqlsrv and pdo_sqlsrv drivers

Fix DSN detection in the IBM DB2 driver

Simplify test suite configuration

Report coverage unconditionally on Travis

pcov is fast enough for this to be acceptable.