LogLevel

Prajna Trace level, the lower the level, the more important of the message.

Record Field	Description
`Error` Signature: LogLevel Modifiers: static	Error/exception messgae, should always be outputed.
`ExtremeVerbose` Signature: LogLevel Modifiers: static	WildVerbose, extreme detailed execution trace (serious impact on performance, not commonly used. )
`Fatal` Signature: LogLevel Modifiers: static	Fatal error
`Info` Signature: LogLevel Modifiers: static	Information, normally be outputed (default trace level is Info)
`MediumVerbose` Signature: LogLevel Modifiers: static	MildVerbose, extra information (may slightly impact performance.)
`MildVerbose` Signature: LogLevel Modifiers: static	MildVerbose, additional information (usually won't seriously impact performance, during test, Prajna is operated at this trace level. )
`Warning` Signature: LogLevel Modifiers: static	Warning, should always be outputed.
`WildVerbose` Signature: LogLevel Modifiers: static	WildVerbose, detailed execution trace (non-trival impact on performance, usually used during intensive debugging of a hard to fix bug. )