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+ optimize redraws (i.e., avoid to redraw if possible)
- move configs in config.h
- add Makefile
- auto-arrow 'A' (automatic end-char)
- change screen management (i.e., use an array of lines)
- read file at point
- parse control characters 
  - parse arrows (text-mode will allow movements as well)
- implement CTRL+G as abort (aside ESC)
- change "g" command:
  - g-g (goto top-left)
  - g-G (goto bottom-right)
  - g-m (goto middle)
  - g-[hjkl] (goto leftmost, bottom, top, rightmost)
+ visual selection
  - crop
  - yank/put
  * fill
  * delete
- undo (by storing lines changed across insert/remove operations)
- manage special chars (DEL/CANC) during text insert
  (also do not print unmanaged chars!)
- get screen geometry
- allow scrolling (both vertical and horizontal)
* move style commands in a separate function 
  (and allow style change in all the modes...)
* add "vis" (for visual) in mode strings
* implement "." to reset styles to defaults.
* load from file
* check if modified on exit
* write to new file / default file
* delete -- 'x' 
* save to file
* implement arrow
* set different line styles (done for hl, vl, corner)
* add status bar
* implement box