This is the main entry point to logging. Note that the extra set of parentheses are required due to limitations in C89 macros.

This will format a string with the current file and line number to the log file if logging is enabled.

This must be called with a context object defined by one of the dIMCTX macros in scope.

This can also be called as mm_log((level, format, args)) in which case the currently active context is used and any in scope context is ignored.