Fix "favorites" display (bar of apps used in a scenario)

[#1]

Description -

• Fix how the "favorites" bar works

Why is this feature important to you -

• It's bad UX and after 6 of those apps the menu gets truncated. 
• it's not really favorites since it keeps any app that has a module placed in the canvas

How would you like the feature to work -

• If it's "all apps used in this scenario"
  • Don't name it "favorites"
• If it's "favorites"
  • Don't remove apps when not used in a scenario
  • Same faves across all scenarios (ie, user-based)
• In either case
  • App bar should be scrollable
  • The + (add) should be always visible (currently it moves outside the viewport)
  • The popup menu of the app's modules should be placed so the right edge is within the viewport

Current Behaviour -

• one icon per each app in scenario (whether connected or orphan)
• not "favorites" but specific to scenario
• re-generated when going into edit mode (apps that are not used in the scenario get removed)
• length of favorites bar grows with window width
• as apps fill bar the popup menu becomes unusable due to placement