Update tree icons on overview and entities pages

The icons used for the trees on the overview and entities pages are not consistent.
Update the icons used for

• 'inter-router' links and connections (double arrow line)
• 'router' addresses (two double arrow lines)
• 'mobile' addresses (use same icon as topology page clients)
• 'endpoint' links (use same icon as topology page clients)
• links and connections associated with consoles (same as topology)
• 'router-control' links (cog)