[libpanel] (26 commits) ...merge: layout, layout item, renames, save delegate

[Christian Hergert <chergert src gnome org>]

Summary of changes:

  c172475... dock: rename PanelDockPosition to PanelArea (*)
  724dd73... dock: rename PanelDockSwitcher to PanelToggleButton (*)
  7efaf15... actionmuxer: fix license (*)
  e827508... position: add PanelPosition object (*)
  d4a0657... macros: add simple macros header (*)
  9585d8b... layout: implement PanelLayout and PanelLayoutItem (*)
  e052b39... types: add panel-types.h and use it (*)
  3448271... example: add save delegate example (*)
  d16ca67... frame: use template callbacks for tab-view signals (*)
  6bb712d... frame: cleanup callback name (*)
  002e6ad... frame: attempt to save modified pages with save delegates (*)
  88cfc24... layout: remove g_autoptr() usage (*)
  b41cea3... save-dialog: use AdwMessageDialog (*)
  bb77cc0... save-delegate: use string helpers for properties (*)
  e26abf0... save-delegate: add is-draft property (*)
  73b7c85... save-dialog: implement save dialog visuals (*)
  4f01c4e... save-dialog: add discard signal (*)
  8df5520... widget: add panel_widget_force_close() (*)
  120af7a... save-delegate: add close signal (*)
  7d37e7e... save-dialog: add close-after-save property (*)
  829ae42... frame: set PanelSaveDialog:close-after-save (*)
  032c34e... save-delegate: fix emission of save signal (*)
  cbb37a5... example: only use one save delegate (*)
  b35a8d7... save-dialog: use binding manually (*)
  e5780e9... libpanel.h: give access to panel-save-dialog.h (*)
  a4c2e7e... merge: layout, layout item, renames, save delegate

(*) This commit already existed in another branch; no separate mail sent