Replaces the "callOutputAndPlotFcns" in the simplex with the new plot events

[StephenNneji]

callOutputAndPlotFcns is used 5 times in fMinSearch.m these have now been replaced with triggerEvents. Also adds a method hasPlotHandler so triggerEvent can check when a plothandler is present and exit early if not.

Also Fixes #168

[StephenNneji]

@arwelHughes I am concerned this could affect the speed significantly when plotting during optimization

problem = load('DSPCBilayerProjectClass.mat').thisProjectClass;

% Make a controls block
controls = controlsClass();
controls.parallel = parallelOptions.Points;
controls.procedure = procedures.Simplex;
controls.maxIter = 1;

figure(2); clf
eventManager.register(eventTypes.Plot, 'plotRefSLDHelper')
% eventManager.register(eventTypes.Message, 'disp')

[problem1, result1] = RAT(problem, controls);

eventManager.clear()

When running the example above, the times go from ~0.02 sec without plotting to ~1 sec with plotting. This time difference will grow with more iterations. Potential solutions

• Reduce number of calls to plot from 5 to maybe 1
• Speedup of plotRefSLDHelper since plot cannot be performed on another thread