FEATURE: Added DEBUG logging level

 * messages with debug level will be automatically written into
   pastebin, clipboard(via button), stdout and FTBLauncerlog.txt
 * Will be shown user only if LogType DEBUG is selected in console window
CHANGED: LogType.java: use comparable interface
CHANGED: converted old debug logging code into new logDebug()
Merge pull request #750 from jikuja/feature_debug

Added new DEBUG log level