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0084dbaa6d
Add convenience function ncplane_home(). Add an ncblitter_e param to ncplane_qrcode(), and split int maxversion into value-result int* ymax and int* xmax. Write the actual sizes of the resulting visual into these parameters. Update the qrcode demo. Add the qrcode PoC. Update demos to ncplane_home(), where possible. ncplane_qrcode() now takes an ncblitter_e and two value-result int*s in the place of a single value int. The final size of the displayed qrcode is written to *ymax and *xmax. If the code can't fit within the specified dimensions, an error is returned. Standard rules for pluggable blitters apply regarding fallback etc. #699