Ketarin-Mono-1.0.43

Fixed #15

Updated ObjectListView.cs with changes from a more recent version from
the original author.  These changes protected against the specific crash
that was reported and protected against some other potential crashes,
but still left a similar crash.  The similar crash was fixed by changing
AddRange() to Add() for individual items.  This makes the program
slower, possibly noticeably slower.

Also removed #if MONO code, since the updates from the newer
ObjectListView eliminate the need.