Revert "Teach live_loop to thread result back into itself:"

This reverts commit 203e0bc48e064c6af7a2fc38d37ee1c46bc1703d.

Unfortunately this commit slipped in a load of experimental noodling
I've been doing. Undo undo undo!

Conflicts:
	app/server/bin/compile-extensions.rb
	app/server/core.rb
Just teach live loop to thread results through itself

* Allows you to thread a context through a live loop
* For example, you could use it to count the num of
iterations:

live_loop :foo, init: 0 do |cnt|
puts cnt
play 50
sleep 1
cnt += 1
end