[Setting] Allow grouping / sections for the settings of a tool

[bogdan-iancu]

Instead of having a single list of setting (per tool), ideally we should be able to group those settings in sections (like setting related to displaying, to DB, etc).
The purpose is just for displaying the settings, no impact on how the engine works.

An idea will be to add some special records in the setting array to act as simple "Title of the section" when displaying - by doing this we can control the ordering (where the titles are inserted in the list of settings)