[DBAL-2953] Fixed unqualified PDO class name

Inherit table charset/collation from db charset

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

Use @var instead of @param

removed an else condition, fixed a parameter annotation and make little improvements

Forward compatibility with 3.x

Expressed PARAM_*_ARRAY through other constants to eliminate the dependency on the actual constant values

Close #2998
the commit.

Simplify returns

Update license's copyright

Fix annotation types

[DBAL-2954] Removed error suppression in IBM DB2 Statement

Implemented Statement::fetch(PDO::FETCH_COLUMN) in non-PDO driveres