Axl debug levels.

While reporting log to the console, these levels are used to report the severity for such log.

Enumerator:
AXL_LEVEL_DEBUG  Debug level.

Only used to report common circumstances that represent the proper functionality.

AXL_LEVEL_WARNING  Warning level.

Only used to report that an internal issue have happend that could be interesting while reporting error, but it could also mean common situations.

AXL_LEVEL_CRITICAL  Critical level.

Only used to report critical situations where some that have happened shouldn't.

This level should only be used while reporting critical situations.