fix: 822 On production build, the override of endpoint url is not took into account on state relative to current page

- add option to allow demo mode (display theme selector)
- fix start:dlcmtest to use dlcmtest api and not just auth
- add option to force runtime setting override (usefull to test on dev env)

fix property 'logged' was private, make it public

Create core folder and move all singletons services inside

implement login/logout for mobile toolbar component

add lint fix script and lint the project

Set language on store and determined default language from session storage, browser or default setting

Make visible the current menu