Add option to align blocks placed in Footer Third Container

Problem/Motivation

The Footer Third Container is the right most. Still it is left aligned. So it does not give a proper impression as if right alignment was applied.

Steps to reproduce

Proposed resolution

On a large display it would be nice to optionally align its content to the right side.

It would be nice to have this for all the Groups. Then the first Container can be aligned left, the Second can be centered and the third could be right.

Remaining tasks

User interface changes

API changes

Data model changes