fixes #2302

- includes extended default driver connection parameter handling
- minor refactoring

fixes #1183

- fixes platform's COMMENT ON statement support
- implements reverse engineering for column comments
- marks boolean column type commented for distinction

fixes #2182

 Closes #2436

So they get passed to the SQLLogger on `Statement::execute`.

When following error message is shown, then it will get converted to the
correct Exception classs of NotNullConstraintViolationException:

  PDOException: SQLSTATE[HY000]: General error: 1364 Field '...' doesn't have a
  default value

For example if the DebugStack SQL logger contains 3 queries, then we want an output like this:
```
3. <query 3>
2. <query 2>
1. <query 1>
```
not like that:
```
4. <query 3>
3. <query 2>
2. <query 1>
```

+ Change formating of code