Prevented MauticAddon bundles from being added to Mautic's core bundle list
Set admin menu to match main menu
Prevented removing "Mautic" from addon bundle names so we can use it for "core" addons
Moved Integrations to admin menu
Moved SocialBundle to addons/MauticSocialBundle and removed special treatment for it in the Integration bundle.  Also started to "divorce" the IntegrationBundle form the SocialBundle.