allow to pre-define colors to choose from (#2481)

src/DependencyInjection/Configuration.php

@@ -410,6 +410,19 @@ class Configuration implements ConfigurationInterface
                 ->booleanNode('show_about')
                     ->defaultTrue()
                 ->end()
+                ->booleanNode('colors_limited')
+                    ->defaultTrue()
+                ->end()
+                ->scalarNode('color_choices')
+                    ->defaultValue(implode(',', [
+                        Constants::SOFTWARE . '|' . Constants::DEFAULT_COLOR, 'Silver|#c0c0c0', 'Gray|#808080', 'Black|#000000',
+                        'Maroon|#800000', 'Brown|#a52a2a', 'Red|#ff0000', 'Orange|#ffa500',
+                        'Gold|#ffd700', 'Yellow|#ffff00', 'Peach|#ffdab9', 'Khaki|#f0e68c',
+                        'Olive|#808000', 'Lime|#00ff00', 'Jelly|#9acd32', 'Green|#008000', 'Teal|#008080',
+                        'Aqua|#00ffff', 'LightBlue|#add8e6', 'DeepSky|#00bfff', 'Dodger|#1e90ff', 'Blue|#0000ff', 'Navy|#000080',
+                        'Purple|#800080', 'Fuchsia|#ff00ff', 'Violet|#ee82ee', 'Rose|#ffe4e1', 'Lavender|#E6E6FA'
+                    ]))
+                ->end()
                 ->arrayNode('chart')
                     ->addDefaultsIfNotSet()
                     ->children()