git-gui: Convert blame to the "class" way of doing things

Our blame viewer code has historically been a mess simply
because the data for multiple viewers was all crammed into
a single pair of Tcl arrays.  This made the code hard to
read and even harder to maintain.

Now that we have a slightly better way of tracking the data
for our "meta-widgets" we can make use of it here in the
blame viewer to cleanup the code and make it easier to work
with long term.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

git-gui.sh

@@ -1590,7 +1590,7 @@ blame {
 		exit 1
 	}
 	set current_branch [lindex $argv 0]
-	show_blame $current_branch [lindex $argv 1]
+	blame::new $current_branch [lindex $argv 1]
 	return
 }
 citool -