Will use random waits when a write conflict is detected.
This should allow several clients to write at the same time.
Inspired from CSMA/CD (ethernet way of handling collisions).
Bug report by TNT-UP @ MC Forum post no.1684
Allows user-defined regexes to be used instead of built-in chat
detection routines for matching messages on server using a non-standard
chat format. Built-in detection routines can be disabled using a single
setting, based on a contribution by ZizzyDizzyMC.