This time it may be for good.
### Implementation description
As requested I added the preprocessing functionality into the pattern
editor. I had to duplicate a few functions and update the c++ library to
version 20. but now I can make sure the pattern editor doesn't see a tab
again. I also removed the preprocessor from where it was before because
it is not needed anymore. The changes were tested using a file that used
tabs for all its white space. The file was pasted into the pattern
editor and imported as well. I both cases no crashes occurred and the
files had no tabs on them.
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