- Introduced `VLOG(verboseLevel)`, `CVLOG(verboseLevel, logger)`, `VLOG_IF`, `VLOG_EVERY_N`, CVLOG_IF`, `CVLOG_EVERY_N` for verbose logging to be more compatible with other major logging libraries - Introduced `VLOG_IS_ON(verboseLevel)` to check if specific verbose level is on - Some code improvements by inlining some code