 * strlen function which is aware of unicode
 * make scroll configurable by config.h in suckless style
   - configure option for scroll length: nth-linewise and/or pagewise
   - configure option for scrollbackbuffer size
 * hotkey to dump buffer to file (like screen hardcopy)
 * screen refresh on window size change
 * scroll back if screen was cleared (sh; ls; clear; scrollup())
