Add button context and tutorial button
Add button contexts
Fix icon reset for tutorial button
Unload all controllers on unload
Add tutorial location for popovers
Add tutorial popover
Add tutorial controller
Tutorial popover styling
Add controller and action for tutorial button
Fix them previews
Remove previews when switch select
Add a bit of line height to the popover paragraphs
Make notifications on undefined sources
Remove previews when switch select
Inherit Controller in tutorial constructor
Animation Love for Tutorial Popover
Some more basic tutorials shizzle
Merge branch 'feature/tutorial' into develop