Tidy up Logger in preparation for optimizations.

Highlights:
 - Clean up documentation. Moved internal docs from variable use site
   to declaration site, especially for special cases around null.
 - Move default variable values to declaration
 - Move methods requiring LogManager synchronization to LogManager.
   This includes setLevelImpl(), forceChildsToInherit(),
   internalSetParent() and getLoggerWithRes().
 - flip "if (null == foo)" to "if (foo == null)" for readability
 - Rename updateResourceBundle to initResourceBundle. Made method
   non-static.
 - Rename initHandler to initHandlers; changed the method to
   short circuit on negative 'handlerInited' cases.
 - Flipped "internalIsLoggable" methods to short-circuit.
 - Expose variables used by LogManager as package-private. For example,
   the childs variable is only used by LogManager, but previously it
   went through the Logger class each time it was used.

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