Add debugging possibility

[LittleHelicase]

Either create a server or compile to javasript and show debugging information in the interactive html page.

Information and controls that should/could be available:

• "Step through", e.g. for every (selected) atomic
• Current value of each channel
• Log all events over a channel
• Show waiting nodes
• Show different recursion levels separately
• Record / replay feature with black boxing compounds (could increase speed significantly?)