Add left/center/right alignment to block advanced settings

This is a question that has come up so many times. While bootstrap does provide CSS classes to do this, editors do not usually understand CSS and are confused on how to change alignment.

Therefore I am proposing we add a radio button to advanced settings to toggle the alignment. It would simply add a CSS class to the respective element. Default should be "default" which would not apply any class.

Would appreciate feedback from others about this issue. Once again, the line between content and design is really hard to define, we're mostly playing it by ear based on feedback we get from developers and editors on what things frustrate them or would make their life easier.

Start by locating the block advanced-settings entry point and the existing Bootstrap class handling. Confirm how a left/center/right radio control should represent the default state and apply alignment to the respective element. Done means editors can select each alignment, while the default option adds no class.

Written by the indexing model from the issue text.