Use the APCA contrast algorithm to better select light or dark text in ideal_fgnd_color()
#1062
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This updates the
ideal_fgnd_color()util function add the APCA contrast also. This determines Lc contrast between overlaid text on a background color. The background is fixed and the text color is swapped to the alternative (lightordark) that maximizes contrast. The code here is adapted from the SAPC APCA (Accessible Perceptual Contrast Algorithm). The WCAG algo has been added here as a (non-default) alternative indata_color(). Here is a comparison table demonstrating the differences between the WCAG and APCA contrast schemes.