Colour vision modes: Protan, Deutan and Tritan in Preferences › Graphics (#778) (#1007)

Colour vision modes (Protan, Deutan, Tritan) in Preferences > Graphics, with palettes, shader and icon colours adapted per mode, translations and tests.

crates/ui-egui/tests/scenarios/colour_vision_setting.json

@@ -0,0 +1,25 @@
+[
+  {"note": "#778: Preferences › Graphics › Colour vision. A mode applies at once, Cancel puts it back, OK keeps it, Restore Defaults on Graphics resets it, and the window keeps its size."},
+  {"click": {"handle": "titlebar:preferences"}},
+  {"expect": {"prefs": {"dialog": "General", "color_vision": "off"}, "same_width": "prefs:window"}},
+  {"widget": "Graphics"},
+  {"expect": {"shown": "Colour vision", "prefs": {"dialog": "Graphics"}, "same_width": "prefs:window"}},
+  {"widget": "Off"},
+  {"widget": "Deutan"},
+  {"expect": {"prefs": {"color_vision": "deutan"}, "same_width": "prefs:window"}},
+  {"widget": "Cancel"},
+  {"expect": {"prefs": {"dialog": null, "color_vision": "off"}}},
+  {"key": "Comma", "cmd": true},
+  {"widget": "Graphics"},
+  {"widget": "Off"},
+  {"widget": "Tritan"},
+  {"widget": "OK"},
+  {"expect": {"prefs": {"dialog": null, "color_vision": "tritan"}}},
+  {"key": "Comma", "cmd": true},
+  {"widget": "Graphics"},
+  {"expect": {"shown": "Tritan", "same_width": "prefs:window"}},
+  {"widget": "Restore Defaults"},
+  {"expect": {"prefs": {"color_vision": "off"}}},
+  {"widget": "OK"},
+  {"expect": {"prefs": {"dialog": null, "color_vision": "off"}}}
+]