Update compressedlut.cpp

Update compressedlut.h

Update help.txt: hex values, signed func fix

1) In the text file mode, it accepts a text file that contains hexadecimal values (instead of integers). I made this change because it would be confusing to ask users to convert their floating point values into fixed-point then into integers and then into unsigned integers. Now, they can provide hexadecimal values (refer to example.txt in the attached file).

2) In the function mode, it implements signed functions without changing the original equation. The tool prints out the input and output format as well.

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Update logo.txt

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