Spin Hint

[mopfel-winrux]

This PR adds a %spin hint to vere. This hint provides a labeled compute stack in shared memory. It also includes an SSE endpoint located at /~_~/spin which will push the current non-empty stack to the SSE endpoint as a comma separated value string. The endpoint is set to sample the spin stack at 10kHz (0.1 ms).

To test this:

• boot a fake ship
• login to the webui
• navigate to /~_~/spin
• in dojo enter

=g |=  l=(list @)
  ~>  %spin.[(scot %ud (lent l))]
  (turn l |=(a=@ ~>(%spin.[(scot %ud a)] (met 3 (jam .)))))

• run (g ~[1 2 3 4 5 6 7 8 9 10]) in dojo.
• On the website you should see:
  

[mopfel-winrux]

As per @joemfb, we want to push the current pointer onto the road system and if the inner road bails, restore it to the previous one

As per @frodwith, the timer should only go off iff something is connected

[mopfel-winrux]

As per @joemfb, we want to push the current pointer onto the road system and if the inner road bails, restore it to the previous one

As per @frodwith, the timer should only go off iff something is connected

Both of these are done. Going to mark this draft as ready for review

[Fang-]

Some nits and a concern about potential timer doubling.

[joemfb]

This looks great. I have a few nits about code organization. It'd be great to try it out in term.c at some point. And we should probably add some spin-stack entries for top-level ipc messages (snapshot save, &c).

[joemfb]

A few nits: