launcher: purge auth Mojang (depreciee), Microsoft uniquement

- bootstrap: validateSelected() ne tente plus de sign-in Mojang
- suppression formulaire login.ejs / login.js et de la vue login
- authmanager: retrait addMojangAccount/removeMojangAccount/mojangErrorDisplayable
- configmanager: retrait clientToken et helpers comptes Mojang
- settings/processbuilder: flux Microsoft uniquement (user_type=msa)
- landing: retrait du refresh de statut Mojang (fonction + UI + CSS)

launcher/app/app.ejs

@@ -30,7 +30,6 @@
     <%- include('frame') %>
     <div id="main">
         <%- include('welcome') %>
-        <%- include('login') %>
         <%- include('waiting') %>
         <%- include('loginOptions') %>
         <%- include('settings') %>