support comments for .hexplt files in all scripts that use them

[earthbound19]

I added comments to some .hexplt files in _ebPalettes, and have begun to support this in scripts, but just found that it breaks BWsvgRandomColorFill.sh. (A created array contains comments.) All these scripts have paletteFile variables that may also be candidates for fixing:

BWsvgRandomColorFill.sh
color_growth_hexplts_multiColor_Ntimes.sh
color_growth_hexplt_multiColor.sh
findPalette.sh
hexplt2ppm.sh
hexplt2ppmHEX.sh
hexplt2rgbplt.sh
renderHexPalette.sh
rgbplt2hexplt.sh
color_growth_hexplt.sh
palette_combinatronics.py

The fix for bash scripts is to grep the hex RGB pattern; see renderHexPalette.sh:

# get array of colors from file by extracting all matches of a pattern of six hex digits preceded by a #:
colorsArray=( $(grep -i -o '#[0-9a-f]\{6\}' $hexPaletteFileName | tr -d '#') )

[earthbound19]

keep comments in palette sort with rgbHexColorSortInOkLab.js

[earthbound19]

to do: update list in OP to include any new scripts made since it

[earthbound19]

fixed in getN_hexplt_shadesXchromas_Oklab.sh