gui_toolkit 0.48.0

Added

• ui.NAMED_PALETTES: eleven more palettes from well-known editor schemes, each with its own accent: Gruvbox and Gruvbox Light, Naysayer, Solarized and Solarized Light, Monokai, Tokyo Night, Catppuccin (Mocha) and Catppuccin Latte, One Dark and Everforest. palette_named finds them by name; a test checks that every named palette keeps its text legible on its background and panels and its dark flag in line with its background.