Application wide updates for dark mode support including dark canvas option and better colors

appGUI/preferences/general/GeneralAppSettingsGroupUI.py

@@ -292,9 +292,14 @@ class GeneralAppSettingsGroupUI(OptionsGroupUI2):
             if theme_settings.contains("theme"):
                 theme = theme_settings.value('theme', type=str)
             else:
-                theme = 'white'
+                theme = 'light'
 
-            if theme == 'white':
+            if theme_settings.contains("dark_canvas"):
+                dark_canvas = theme_settings.value('dark_canvas', type=bool)
+            else:
+                dark_canvas = True
+
+            if theme == 'light' and not dark_canvas:
                 self.app.cursor_color_3D = 'black'
             else:
                 self.app.cursor_color_3D = 'gray'