News in 46.0, 2023-07-29
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* Adapt for Amtk -> libgedit-amtk rename.
* API changes for plugins: see the API docs.
* Code refactorings in GeditWindow, and delegate some of its work to new
  classes: GeditHeaderBar and GeditSidePanel.
* Replace GeditMenuStackSwitcher by TeplPanelSwitcherMenu.
* Replace GeditStatusMenuButton by TeplStatusMenuButton.
* Remove a small feature from the statusbar: the small icons for the window
  state. You now need to look at each individual tab to know its state.
* Build: replace inline_side_panel_switcher option -> headerbar option.
* Bug fixes for macOS.
* Translation updates.