* client: semantic ui -> bootstrap 4 and less -> scss
* start porting components to boostrap
* port header, start porting menu
* port loading screen
* port most of the menu
* port secondary menus
* port guilds and stable
* disable tavern for now, port inbox
* typo
* put back old tavern code
* some stable work and faster less recompilation
* user with zero tasks can use the app
* wip work to show loading status of resources
* revert changes to sync
* try to freeze content object
* deep freeze the content object, start to implement stable
* freeze at the /common level
* go back to freezing content only on the client
* use deep-frezze-strict to support phantomjs
* use own version of deepFreeze
* update comment about deepFreeze