Added new option to place footer icons at the bottom or not.

[carddamom]

I've noticed that when there is a footer builder enabled to set up a title for a footer, for example, and footer items, the items are aligned to the bottom of the sidebar instead of being immediately below the title.

Looking at the code, I noticed that this is because of the reverse option in the footer list view, to I've added a new property to SidebarX to specify if the list view items should be reversed or not.