Rename caching constants
Restructure constructor to avoid some extra comparisons
Add own implementation of CompoundEnumeration to avoid 'use of proprietary API' warning
Move classes into 'util' package
JavaDoc for logging package
Add missing cases to handle all log4j log levels
Add connector for java.util.logging
Log level 'ALL' corresponds to lowest log level
Move ConsoleLogger back to the core project
JavaDoc for PlugzLogger and SilentLogger now is internal
JavaDoc for PlugzLogLevel