Rushbot.ntj now writes rusher name to file
Added support to char switch
Default rushee pos is 0
Added message handler for rush over.
Added functions NTR_RetrieveRusherName() and NTR_FindRusher()

This functions find the rusher name in the aproppiate file and wait for
him to join game respectively. NTR_FindRusher() also returns rusher name
for use in the bot script.