[cXF] Add What's New beside Alerts tab 1.6.1

• compatibility fix for [XenConcept] Linked Accounts add-on

• compatibility fix for UI.X style: now it works with this style beside Alerts icon
• remove link title on hover when icon is beside Alerts tab

• option to show What's New icon on the far right corner on mobile

• NEW: option to set link button to point to What's New or New posts page

• option to set icon color

• css icon fix
• option to add What's new beside Alerts tab or beside Search Tab

• option to add text beside icon