BTChatService - buffer issued solved (w/ mem. leaks); Avg's data values; FileInfo & NewFile additions/adjustments

Buffer doesn't not send data until "END/r/n" is found in the array of
bytes
--> data is stored resizable ArrayList<Byte> object
--> actual data is sent to MainActivity to plot when it searches &
finds "69 78 68 13 10" in byte array

- Raw data is averaged and average is subtracted from actual data values
--> should result in a more accurate FFT of data
(large arrays of data => accuracy is VERY questionable b/c there are
more zeros at the end of the power of 2 raw data array)

FileInfo & NewFile classes have been updated to (partially & sometimes
inaccurately) display what kind of data is being saved. -> Raw data or
Range