Monitors list should support sorting by Monitor class name

[irockel]

At present the Monitors list is unsorted. It would be extremely useful if it
could be sorted by the classname of the monitor, as these are often closely
related, and typically there are just one or two classes you really care about.
There's an argument for making the sorting configurable so you could sort by
either class name or object address, but I think if time is tight then sorting
by class name would be more useful.

Moved from here: https://java.net/jira/browse/TDA-16

[irockel]

There is a sorting available if you right click in the monitor view, the
monitors will be sorted by thread count, so the most important monitors are at
the top.
I will see if I can add an initial sorting by class-name of the monitors...