Make biboumi add an asterisk to Last Message Correction corrections

LMC is a handy feature. Obviously, the XMPP use cannot be translated 1:1 to IRC. However, it is customary to mark changed messages with * (either at the beginning of the message or close to the first change).

I propose that either:

1. biboumi prefixes the body of LMC messages with * or
2. biboumi compares the corrected version with the original version and put an * before the word of the location of the first difference.

Example:

Original message        : I fronicated the fnord.
Corrected message (XMPP): I frobnicated the fnord.
Corrected message (IRC) : I *frobnicated the fnord.

(It’d also be nice if biboumi reflected the message as LMC including the * so that XMPP clients can show it nicely.)

Things to consider: Correcting a typo in the leading /me of an action message (e.g. if you typed /ne instead of /me can’t work that way).