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* While xcurses-config does define PDC_WIDE, it does not
  define PDC_NCMOUSE, which we currently rely on so that
  NCURSES_MOUSE_VERSION is set correctly.
  Therefore we check for it just like when using --with-interface=pdcurses.
* The modifiers were broken on all variants of PDCurses.
  This was a regression from v2.4.0.

Must not (and don't have to) probe the clipboard on startup.
We just assume there always is a clipboard.

* There is yet another PDCurses vs. ncurses incompatibility:
  ncurses has a mouse event queue so you must call getmouse() repeatedly
  for every KEY_MOUSE, while PDCurses apparently doesn't queue and would
  end up in an infinite loop. I.e. the program would hang once
  you press any mouse button.
* This forced us to add an PDCurses-specific version of teco_interface_getmouse().

* Fixes input hangs on PDCursesMod/WinGUI, where we depend on polling for CTRL+C.
* ncurses apparently does not need this workaround as it treats all of the
  aforementioned calls as equivalent.

* When passing a struct that should not be modified, I usually use a const pointer.
* Strings however are small 2-word objects and they are often now already passed via separate
  `gchar*` and gsize parameters. So it is consistent to pass teco_string_t by value as well.
  A teco_string_t will usually fit into registers just like a pointer.
* It's now obvious which function just _uses_ and which function _modifies_ a string.
  There is also no chance to pass a NULL pointer to those functions.

* This is still rendered as underlined text.
* It uses a new Scinterm upstream feature, so we can
  switch back to the upstream repo.

* When constructing the list of popup items, the unnamed buffer is stored as the empty string
  instead of a prerendered "(Unnamed)".
  Using the empty string simplifies autocompletions, which will actually have to insert nothing
  at all (in addition to terminating the string).
* Since unnamed buffers are now special in the popup list, we can render them with special
  icons as well.
  Currently, only on Curses we use a file symbol with a question mark.
  There doesn't appear to be a fitting standard Freedesktop icon to use on GTK and there
  isn't even any fitting standard emblem to lay over the default file icon.

* Other editors call "backup files" previous copies of saved files.
  This role would be served by savepoint files in SciTECO.
* Likewise filename~ would point to such a backup file.
  It therefore makes sense that savepoint files also end in tildes (.teco-n-filename~).
* Security copies of modified buffers would be called "auto-saves" (Emacs) or
  "swap files" (Vim).
  Both of these terms is IMHO misleading, so SciTECO now uses the
  term "recovery file".
* "Recovery files" are now named #filename# just like in Emacs.