 * strlen function which is aware of unicode
 * single char based I/O to buffer I/O
 * make scroll configurable by config.h in suckless style
   - configure option for scrollup/-down hotkeys
   - configure option for scroll length: nth-linewise and/or pagewise
   - configure option for scrollbackbuffer size
 * hotkey to dump buffer to file (like screen hardcopy)
 * new hotkeys
   - scrolling by mouse wheel
   - scrolling by shift+PageUp/Down
