Prepared siminterface and logio code for the implementation of a log viewer
for watching the log output at simulation time. This feature has been prepared
and described in the code (BX_ASYNC_EVT_LOG_MSG), but it was never implemented.
A viewer window could be implemented easily in wx. The gui debugger could also
have an option to view the log output while debugging.


git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12103 6c8e4198-a580-4521-a02f-c9ae86df1db9