Generate shortcut to the Visual Studio solution in the top directory when preparing the build on Windows.

Respect freedesktop standards for configuration and user data files, and handle migration from old location to the new one.

The migration is deactivated for the moment and needs to be enabled when the app is ready to be used.

feat(ui/modules/Linphone/Chat/Message): message text supports scrolled selection & remove useless code

feat(ui/views/App/Main/Home): `Invite friends` and `Assistant` windows are now directly in this view

fix(ui/views/App/Settings/SettingsCallsChat): bind selectedButton of encryption and lime to the right value