* Improve unicode text edition

  - support reading/writing non utf8 encoded files

  - more robust utf8 implementation

  - support multi column chars

  - right-to-left, bidirectional text

* key binding support

* Mouse support

* Crash recovery support (swap files)

* Detect external file changes

* Sanitize prompt history handling, hooks should not have side effects
  on history

* improve input filters

  - try to have a decent C++ input mode indenter

  - automatic line splitting

* improve highlighters

  - folding support

  - Support defining and reusing highlighters

    . defhl -> add hl to a global group +
      'addhl ref ...' references a highlighter in the global group

    . Conditional ref highlighter (use php highlighter in <?php > blocks,
      use html highlighter outside

  - other types of highlighters (like for correctly supporting nesting,
    which regex are bad at), faster as well.

* improve info boxes

  - More automatic hiding behaviour

  - Pass more params to infos boxes: title, borders, move unicode borders
    building to the ncurses UI, so that an eventual graphical UI can do better.

* improve the option based completion

  - Support different options
    (setb completers word,option=cpp_completions,option=spell_completions)

  - Support multiple completion points
    (1.1@0:comp1:comp2:comp3:1.5@0:comp1:comp2:comp3)

  - smarter behaviour to keep completion available longer

    . keep per line timestamps

    . update completion options when lines are added/deleted

* spelling support

* allow colalias to reference another colalias

* investigate 'kakdiff'

* Tree based undo

* incrementation/decrementation of integers support

* more sane command line parsing, better shell interaction with quoting

  - Real parsing of the command line ?

* configurable evaluated (%sh{...}) strings ? use an option to define
  the interpreters, regex for finding used kak variables (ability to
  add direct python/perl/ruby/whatever evaluation).

* tab support for indentation

* %rec{...%opt{tchou}...%sh{echo kanaky}} ~= "...${kak_opt_tchou}...$(echo kanaky)..."

* Optimize BufferModificationListener behaviour:

  - Editor should modify in reverse order, as a modification at one point does not
    impact the position of selections before it, so applying modification in reverse
    order removes the needs to have selection updated on the fly, and permit deferred
    update.

  - Accumulate all the modifications and update the selections with the
    whole knowledge -> try to remove this O(n2) behaviour.

* More text objects: indent, user defined ?

* multiple parameters support for normal mode commands ?

  - 10,20g -> goto line 10, column 20

  - 1,2,3<a-space> remove selections 1, 2 and 3