Experimental support for Kitty image protocol in preview window

Close #3228

* Works inside and outside of tmux
* There is a problem where fzf unnecessarily displays the scroll offset
  indicator at the topbright of the screen when the image just fits the
  preview window. This is because `kitty icat` generates an extra line
  after the image area.

    # A 5-row images; an extra row at the end confuses fzf
    ["\e_Ga ... \e[9C􎻮̅̅ࠪ􎻮̅̍ࠪ􎻮̅̎ࠪ􎻮̅̐ࠪ􎻮̅̒ࠪ􎻮̅̽ࠪ􎻮̅̾ࠪ􎻮̅̿ࠪ􎻮̅͆ࠪ􎻮̅͊ࠪ􎻮̅͋ࠪ\n",
     "\r\e[9C􎻮̍̅ࠪ􎻮̍̍ࠪ􎻮̍̎ࠪ􎻮̍̐ࠪ􎻮̍̒ࠪ􎻮̍̽ࠪ􎻮̍̾ࠪ􎻮̍̿ࠪ􎻮̍͆ࠪ􎻮̍͊ࠪ􎻮̍͋ࠪ\n",
     "\r\e[9C􎻮̎̅ࠪ􎻮̎̍ࠪ􎻮̎̎ࠪ􎻮̎̐ࠪ􎻮̎̒ࠪ􎻮̎̽ࠪ􎻮̎̾ࠪ􎻮̎̿ࠪ􎻮̎͆ࠪ􎻮̎͊ࠪ􎻮̎͋ࠪ\n",
     "\r\e[9C􎻮̐̅ࠪ􎻮̐̍ࠪ􎻮̐̎ࠪ􎻮̐̐ࠪ􎻮̐̒ࠪ􎻮̐̽ࠪ􎻮̐̾ࠪ􎻮̐̿ࠪ􎻮̐͆ࠪ􎻮̐͊ࠪ􎻮̐͋ࠪ\n",
     "\r\e[9C􎻮̒̅ࠪ􎻮̒̍ࠪ􎻮̒̎ࠪ􎻮̒̐ࠪ􎻮̒̒ࠪ􎻮̒̽ࠪ􎻮̒̾ࠪ􎻮̒̿ࠪ􎻮̒͆ࠪ􎻮̒͊ࠪ􎻮̒͋ࠪ\n",
     "\r\e[39m\e8"]

* Example:

  fzf --preview='
    if file --mime-type {} | grep -qF 'image/'; then
      # --transfer-mode=memory is the fastest option but if you want fzf to be able
      # to redraw the image on terminal resize or on 'change-preview-window',
      # you need to use --transfer-mode=stream.
      kitty icat --clear --transfer-mode=memory --stdin=no --place=${FZF_PREVIEW_COLUMNS}x${FZF_PREVIEW_LINES}@0x0 {}
    else
      bat --color=always {}
    fi
  '

CHANGELOG.md

@@ -3,6 +3,19 @@ CHANGELOG
 
 0.43.0
 ------
+- Experimental, partial support for Kitty image protocol in the preview window
+  ```sh
+  fzf --preview='
+    if file --mime-type {} | grep -qF 'image/'; then
+      # --transfer-mode=memory is the fastest option but if you want fzf to be able
+      # to redraw the image on terminal resize or on 'change-preview-window',
+      # you need to use --transfer-mode=stream.
+      kitty icat --clear --transfer-mode=memory --stdin=no --place=${FZF_PREVIEW_COLUMNS}x${FZF_PREVIEW_LINES}@0x0 {}
+    else
+      bat --color=always {}
+    fi
+  '
+  ```
 - `--listen` server can report program state in JSON format (`GET /`)
   ```sh
   # fzf server started in "headless" mode