Adding function to merge plaintext into image data
Not finished yet, but started putting this together. Need to test the masking in a separate sandbox and get this logic right, then update the rest of the function.
Bug fix for trailing character 0x255
Fixed the logic bug where the character was saved even if the text file reached EOF (resulting in an extraneous 0x255 in the vector of chars).
Filled out the merge function
But there is still a bug in the bit masking operations. Need to fix it or rewrite that section.