the existing idle resume function can be used on returning to iitc
also, fix the long-standing bug on mobile where the map disappears after repeated touch panning/zooming. seems leaflet gets confused about zoom levels and ends up with a non-ingeger. when this is found, force it back to an ingeger zoom level when this happens
- don't assume jquery is available when initially processing JS - setupIdle function added
- don't detect portals from a 'turret' entry - use 'portalV2' as the stock site does
- don't try to display the field MU counts when not in the data
- times are now in seconds rather than minutes, like all other IITC time settings
- ignore mousemove events for no/small movements - more likely to go idle when it should
