New hook for early prompt/output analyzis.

proof-state-change-pre-hook happens earlier than
proof-state-change-hook, i.e. before proof-done-advancing. This should
be used to register information in the currently processed span before
proof-done-advancing classifies it.

Historically PG design was to gather these information during
proof-done-advancing (or in its hook called at the end) by just
looking at the command statement. But it is often useful to look at
the output (messages and/or prompt) to gather more accurate
information. Some of this information may be needed DURING
proof-done-advancing. Hence this early hook.

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