Add operation to precisely remove dialog configuration

[zsoltk]

Current implementation depends on configuration resulting in dialog being the last one on the stack, and calling router.popBackStack() in DialogRoutingAction.

In most cases this is fine enough. However, there can be cases where this assumption isn't correct, resulting in unpredictable behaviour.

This can be improved by:

• Passing info about specific configuration this dialog was created for. This needs to consider there can be repeated instances across the stack in different positions.
• Creating back stack operation to remove a specific configuration from the stack

[zsoltk]

Implemented as part of #186