High Priority
-------------

* multiple window support

Medium Priority
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* tweak editing model, some behaviours are not intuitive, maybe a line
  wise mode will be needed after all.

* encoding: support different encoding for files, make utf8 implementation
  more robust

* key binding support

* configurable insert mode completion support

* File loading optimizations: loading big files is sloooooooow
  take a look at mmap

* pasting big chunks of text from the terminal is slooooow as well
  optimize that.