Add 'Save Net' and 'Plot Results from Saved Net' options to the Menu bar

[RohanK22]

This feature adds a menu option that allows users to export their ARTwarp categorization results into a MAT file called 'ARTwarp_Results.mat' saved in the current working directory. It works by using MATLAB's save function that writes the DATA and NET variables into a MAT file. It also adds another menu option through which categorization results of an older ARTwarp run can be plotted from a saved mat file.

This might be unnecessary since the user can type in the save command and run scripts manually into the command window. But it might save them a few seconds since using the ARTwarp menu bar is easier.

Limitations:

• It does not allow you to change the name of the mat file when saving the categorization

[olexandr-konovalov]

This is too out of sync to be merged.