Clean start

I am posting this simple script in response to Loren's Art of MATLAB blog entry
http://blogs.mathworks.com/loren/2016/07/11/clearing-the-air-in-your-matlab-session/
Although I do use "clear" or "clearvars" on their own interactively, fairly often I need to reset everything and make sure my class definitions are up to date etc. so this "clean start" script evolved for this purpose. But there are 2 big differences to just using clear classes on its own:
I want to keep breakpoints
I allow an emergency undo by saving state into a file

This comes at a price of how long it takes to do the save etc. I also found timer objects are very persistent so had to include a line to delete these too.