* add `eb_put_filename()` to encode buffer or file names with
non-ASCII characters according to PF_xxx flags
* add `CF_SAVE_LIST` flag for completions to store the list
of matches in `MinibufState`
* fix bufed and dired layout issues
* fix buffer and filename completion popup layout
* add commands to control display of Unicode and non printing
charcaters in buffer or file names:
- U toggles unicode display
- \ cycles through 4 possible encodings: ? ^J \x10 \010
* use `(*fp)()` syntax for indirect function calls
e89e07e318