📣 borb release notes

add Watermark LayoutElement, representing a piece of text laid out over the entire Page. Users can specify the text, font_size, font_color, rotation, and transparency
add Watermark to easy imports
add tests for Watermark
re-implement MultiColumnLayout, with better handling of headers and footers
update requirements.txt where possible
reworked a couple of tests, ensuring they can run without dependencies as well
added a fair use warning to ensure people know the difference between using borb in an open-source vs. commercial setting. This warning is only triggered when producing a high volume of PDF documents.

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