feat: add Illustrator color palettes (Defaults, Grays, Earth Tones)

config/palettes/Illustrator-Defaults.gpl

@@ -0,0 +1,34 @@
+GIMP Palette
+Name: Illustrator Defaults
+Columns: 8
+#
+  0   0   0  Registration Black
+  0   0   0  Black
+255 255 255  White
+255   0   0  CMYK Red
+  0   0 255  CMYK Blue
+  0 255   0  CMYK Green
+  0 255 255  CMYK Cyan
+255   0 255  CMYK Magenta
+255 255   0  CMYK Yellow
+255 153   0  CMYK Orange
+128   0 128  CMYK Purple
+128  64   0  CMYK Brown
+255 192 203  Pink
+255 165   0  Orange
+128 128   0  Olive
+  0 128 128  Teal
+  0   0 128  Navy
+128   0   0  Maroon
+128 128 128  50% Gray
+192 192 192  Silver
+255 255 153  Light Yellow
+153 255 153  Light Green
+153 204 255  Light Blue
+255 153 153  Light Red
+204 153 255  Light Purple
+255 204 153  Light Orange
+153 255 255  Light Cyan
+255 153 255  Light Magenta
+240 240 240  Near White
+ 16  16  16  Near Black

config/palettes/Illustrator-Earth.gpl

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+GIMP Palette
+Name: Illustrator Earth Tones
+Columns: 8
+#
+101  67  33  Dark Brown
+139  90  43  Brown
+160 120  60  Warm Brown
+184 148  84  Tan
+210 180 140  Burlywood
+222 184 135  Wheat
+245 222 179  Navajo White
+255 248 220  Cornsilk
+188 143 143  Rosy Brown
+139 119 101  Warm Gray
+107  84  63  Coffee
+ 85  60  42  Espresso
+156 102  31  Ochre
+184 134  11  Dark Goldenrod
+218 165  32  Goldenrod
+238 203 173  Peach Puff
+ 95 117  87  Sage
+107 142  35  Olive Drab
+ 85 107  47  Dark Olive
+ 46  79  48  Forest Green

config/palettes/Illustrator-Grays.gpl

@@ -0,0 +1,15 @@
+GIMP Palette
+Name: Illustrator Grays
+Columns: 10
+#
+255 255 255  White
+230 230 230  10% Gray
+204 204 204  20% Gray
+179 179 179  30% Gray
+153 153 153  40% Gray
+128 128 128  50% Gray
+102 102 102  60% Gray
+ 77  77  77  70% Gray
+ 51  51  51  80% Gray
+ 26  26  26  90% Gray
+  0   0   0  Black