renamed Logger -> Log
this class has an api (<< operators) for taking what should be put to the log file
as the buffer is used WTextStream which should be allocated elsewhere
added: FileLog - this class saves to a file log
git-svn-id: svn://ttmath.org/publicrep/pikotools/trunk@1149 e52654a7-88a9-db11-a3e9-0013d4bc506e
