Save sort/view mode for each board/space in user settings

[orthecreedence]

So basically, when a user changes the sort order for a board (including "All notes") we should save this setting in the user settings.

I'm not actually sure if there's a core endpoint for user settings, so I'm going to label this as needing a core change as well.

• Save sort mode (created, edited, alpha (Alphabetical sort mode #220)
• Save view mode (list List view for notes #36, large Large view mode #219, or regular/masonry)
• When board is moved to another space, make sure settings are moved

[orthecreedence]

Removing core label, goign to just move the settings portion to its own issue #26