* change root dit and change way to import modules
* update deps to latest versions
* use latest tools for building bundles
* rewrite webpack config
* use nomodule technique for loading modern bundle
* inject polyfills by babel usebuiltins
* update eslint rules
* rename all style files to CSS
* use postcss preset env for building styles
* proper typescript typing
* put all html files to templates folder
* etc
* break auth panel render into submethods
* move var definition
* break renderUnathorized into submethods
* hide login providers behind dropdown if they are exceed length of 3
* amend dropdown to behave nicely being placed in another dropdown
* add style to providers enclosed in dropdown
* add provider reducer and actions
* add provider save/restore to app flow
* place last login provider first in providers list
* infer StoreState from combineReducers return type
* move collapsed threads retoration to action
* fix: provider lost in other
* add dynamic threshold depending on window width
* fix & add tests
Pavel MineevandUmputun
Misha VyrtsevandUmputun