Initial commit global logger
Added Formatter.Name()
Added some global variables

Added DefaultAppendFiles, DefaultAppendWriters, and DefaultAppendLevel
Changed the name of a function

Changed MultiAppendWriter to MultiAppendWriters
Added some global functions

SetFormatter(), SetLoggerMap(), SetEnabled(), Enabled()
Added LoggerMap.Clear()
Added Logger.ClearAppended()
Added globalAppended
Updated the readme