Add more colors for configurations returned by `game_systems()`

[trevorld]

• in particular "orange" and "purple" are the two missing "secondary" colors and I don't think PPN is using O or P.

[trevorld]

Currently we have been using the following "color-blind-friendly" palette:

Currently we use the following colors from this palette:

Suit color	Actual color-blind-friendly color	Trade-offs
Red	Vermilion
Black	Black
Green	Bluish-green
Blue	Sky Blue	Light blue not best contrast from white
Yellow	Orange	playing_cards_colored uses yellow stars which would look bad unless use orange or add black outlines
White	White

We may want to switch to instead use:

Suit color	Actual color-blind-friendly color
Red	Vermilion
Black	Black
Green	Bluish-green
Blue	Blue
Yellow	Yellow	Will need to adjust playing_cards_colored yellow star suit and perhaps yellow Looney Pyramids in {piecenikr} and color choice in plaintext diagrams emitted by {ppgames} and yellow gridlines/squares in boards...
White	White
Purple	Reddish-Purple	One of five-primary hues in Munsell's color system, Purple fish suit in Four Seasons Expansion
Orange	Orange	Used in (sun) Decktet chips, with purple last of secondary/primary colors in RYB system, one of key rainbow colors, Leaf suit in Four Seasons Expansion
Cyan	Sky blue	One of five "xeon" Looney pyramids colors, Flower suit in Four Seasons Expansion, one of key (modern) rainbow colors, primary CYMK color. Note though PPN already uses "C" for "Crowns" suit

Other potential "colors" of interest that may be difficult to incorporate due to color-blindness concerns:

• Clear (i.e. last Looney Pyramids "xeon" "color")
• Brown
• Gray
• Pink
• Light Green
• Light purple or Magenta

Color-blindness simulator: https://www.color-blindness.com/coblis-color-blindness-simulator/

[trevorld]

{cli} "palettes" support the following eight colors:

• black
• red
• green
• yellow
• blue
• magenta
• cyan
• white

Note no orange and uses magenta instead of purple

[trevorld]

Common One Letter Color Abbreviations (i.e. for Portable Piecepack Notation):

• RGB (red, green, blue)
• RYB (red, yellow, blue)
• CYMK (cyan, yellow, magenta, black)
• ROYGBIV (red, orange, yellow, green, blue, indigo, violet)
• (Munsell) Red, Yellow, Green, Blue, and Purple

[trevorld]

Could use actual yellow as yellow (instead of orange) if relevant glyphs had black outlines.

Possible workarounds to get black outlines around glyphs:

• fontr::glpyh_polygon() (but note {fontr} not on CRAN)

• {string2path}

• systemfonts::glyph_outline() (currently we "Suggest" {systemfonts})

  • Not sure how well this works for glyphs with holes in them...

• Manually create/store these glyphs in the package

• Try to layer black open glyph on top of yellow closed glyph (e.g. black "white" chess piece on top of yellow "black" chess piece)

  • May need other compatible fonts in order to do this with numbers / letters (besides other changes to grob functions to allow this in cards)

• Convert to bittermelon objects and add a black "glow" effect

Situations where we have relatively narrow yellow lines on white backgrounds:

• Chess bits
• Suit five (yellow stars) of playing_cards_colored
• I forget if any of the piecepack configurations has a fifth yellow crowns suit or not...
• Lined boards (first draw larger black lines and then yellow lines on top?)