Fix font readability by expanding blacks and trimming whites (#55)
## Summary * Previously, only pure black pixels in the font were marked as black, this expands the black range, and makes the lightest pixels white ## Additional Context * Noticed personally it was kind of "thin" and washed out a bit, this massively helps, should also address concerns raised here: https://github.com/daveallie/crosspoint-reader/discussions/39
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