ZPE breakpoints

I have been seeking to add breakpoints to ZPE for the last seven years, and I have finally succeeded. 

They work using the new bubbling technique I have developed. In ZPE, bubbles are exceptions; a breakpoint is a simple bubble. Bubbles go all the way to the top of the runtime and are handled by the parent. Complex bubbles work entirely differently, and although they are also bubbles, they can be handled by different parts of the program. 

A breakpoint is added to YASS code by writing #breakpoint# where the code should break. In the GUI mode, it will display a variable watch window: