This PR is a rebased version of #1894
All credit goes to @spaprzycki
Top devices & top interfaces widgets
Fixed form IDs
Better SQL queries, but fully broken
Next revision for review - 3 out of 4 queries working happily now
Still slightly lost with git, sorry!
Auto-Deploy finished, Test PR at http://1903.ci.librenms.org or https://1903.ci.librenms.org