Single newlines in procedure descriptions are still considered normal
spaces. But 2 newlines are transformed into 1 newline. 3 newlines into
2 newlines. And so on.
This allows for a start of nicer output in the procedure browser or C
file comments (and consequently in generated html doc).
Works for all item types, and has much less functions and parameters
than the drawable transform API because it uses the new context
states. Untested and not finished!
