added agent position trail to plot

@miSim/plotPerformance.m

@@ -37,10 +37,7 @@ function obj = plotPerformance(obj)
     end
 
     % Add legend
-    agentStrings = repmat("Agent %d", size(obj.perf, 1) - 1, 1);
-    for ii = 1:size(agentStrings, 1)
-        agentStrings(ii) = sprintf(agentStrings(ii), ii);
-    end
+    agentStrings = string(cellfun(@(x) x.label, obj.agents, 'UniformOutput', false));
     agentStrings = ["Total"; agentStrings];
     legend(obj.fPerf.Children(1), agentStrings, 'Location', 'northwest');