Minor usability improvements for Latest data and Hosts views

I would propose the following improvements for Monitoring->Latest data:

1. show "Last check" column in seconds since last update (with time suffixes like "2m 33s") and display date and time (like "2021-12-01 16:04:47") on mouse-over
2. show raw (as is, no units or value mapping applied) last value on mouse over of the "Last value" cells
   1. implement reasonable maximum length (like 64K?) to avoid situations when HTML of the page is too large and thus it is slow
3. always display "Info" column to show information on why item is not supported, for example

Information about active problems should be moved to the second column "Problems" in Monitoring→Hosts, first "Problems" column must be removed

1. Clickable text "Problems" with a link to all host problems must be displayed if no problems exist
2. Color clickable boxes must be displayed with a link (same link regardless of severity) to all host problems if problems exist