Enhancement Tidy up permission icons to new icon library
WIP The modal is a short term workaround until the UI is all react based but we wanted to do some cleanup prior to 4 release
API Remove ssui.button
Enhancement Update buttons to new flat bootstrap style
Standardise template locations
Move CMSSettingsController class to SiteConfig module
Fix CMSMenu behaviour for namespaced admin sections
Split classes into one per file
Manual fixes and cleanup