Handling for Views in db:dump / db:drop

[cmuench]

Feature description

Currently we do not handle views during db:dump operations.
If you run db:dump --drop-tables or db:drop --tablesall existing tables will be removed before the command logic is executed.
If there are views, the views remain. That's expected.

The feature could add additional --drop-views and --views option to the commands.

Problem and motivation

Resolves question in #579

[torhoehn]

@cmuench The title of the issue should contain db:dump instead of db:import, shouldn't it?

[cmuench]

@torhoehn good finding.