support logbook: implement LogbookPanel

details:
- renamed existing ThreadTrackingHandler to ThreadTrackingLoggingHandler
- implemented LogbookPanel, ThreadTrackingLogbookHandler
- renamed existing global variable, functions e.g `handler`, `_init_once()` to
  `logging_handler`, `_logging_init_once()`, etc.
- created global variable, functions e.g `logbook_handler`, etc.