[Category List Widget] Toggle to allow fully expanded category hierarchy
Currently subcategories are made visible in the category list if the parent category is selected or the topic is being viewed.
This feature will create a toggle in the settings that can allow for the category list to be always fully expanded. This could be helpful for communities with a smaller amount of total categories and subcategories.
For communities that are less complex and have less categories and subcategories, it can be quite tedious to always click the parent category to expand the rest.
Being that this feature is a toggle, it would keep the existing functionality for more complicated communities, while also making this simpler for less complex communities.
See Original Request by @downey: