gui_toolkit 0.8.0

Added

• Menus rebuilt (popups.odin): any depth of submenus (menu_submenu, opens on click, after
  MENU_HOVER_MS of hover, or with Right / Enter / Space; to the right of its item, or the left when there is no room),
  menu_separator, disabled items (menu_item(..., enabled = false) or a disabled scope: muted, skipped by the
  keyboard), automatic width (ctx_menu(key) with width 0: as wide as the widest item), placement that stays on screen
  (flips to the other side of the point or anchor rect, then clamps), ctx_menu_open_rect (below a button, above when
  there is no room), ctx_menu_open(..., from_keyboard = true) (first enabled item selected), menu_select,
  menu_depth, menu_rect. An open menu owns the keyboard (key presses and typed text, in order): Up / Down / Home /
  End over enabled items (wrapping), Right / Left through submenus, Enter / Space choose, Escape closes one level, a
  letter selects the next item starting with it. Levels the app stops building close.
• Keyboard lists (list.odin): list(id, &List_State) + list_row(&st, i, label, selectable): one Tab stop with
  an active row; Up / Down / Page Up / Page Down / Home / End (skipping non-selectable rows such as group headers),
  Enter or double click (activated), Escape (cancelled), type-ahead (LIST_TYPEAHEAD_MS), the active row kept in
  view; rows drawn with "selected" / "weak_selected" tags. list_select, list_state_destroy.
• Wrapped text: Box_Flag.Text_Wrap (a .Text height is that of all the lines at the width the X pass gave),
  paragraph(id), wrap_lines.
• Line edit history and commands: Ctrl+Z / Ctrl+Y / Ctrl+Shift+Z (typing and deleting merge into steps,
  FIELD_UNDO_STEPS), Ctrl+Insert / Shift+Insert / Shift+Delete; field_undo, field_redo, field_can_undo,
  field_can_redo, field_cut, field_copy, field_paste, field_delete, field_insert, field_select_all,
  field_has_selection, field_selection (for context menus).
• tab_stops(on) scopes (widgets left out of the Tab order), tab_direction(s) and focus_step(s, from, dir) (an app
  handing the focus to its own content and back), tabs(..., right_clicked, middle_clicked).
• ui.destroy(s) frees the state. platform.Key.Menu (the application key), Num_Add, Num_Subtract (Ctrl+keypad
  plus / minus zoom), keypad digits as N0..N9.
• tests/keyboard: menus (keyboard, submenus, Escape by level, placement, press outside), lists (moves, headers,
  type-ahead, kept in view, Enter / Escape), line edit history and clipboard, wrapped text, without a window.
• fidget: View menu with submenus.

Changed

• ctx_menu (width now optional) pads its panel; State.ctx_menu_key, menu_sel, menu_width... are replaced by
  State.menus (the stack of open levels). Dropdowns open below their button (above without room) and from the
  keyboard (Down, Alt+Down, F4) with the current value selected.