This commit adds:
* replace multiple logging macros with LOG and LOG_DEVEL
* logging configuration for chanserv
* logging configuration for console output
* logging configuration for per file or method log level filtering for
debug builds
* file, line, and method name in log message for debug builds
sem_init() is not functional on Mac OS. Use the Grand Central Dispatch
implementation.
Make libscp_lock.c use semaphores through the thread_calls wrapper.
