Remove out of date TODO file

Closes #1235

TODO

@@ -1,44 +0,0 @@
-* Improve unicode text edition
-
-  - support multi column chars
-
-  - right-to-left, bidirectional text
-
-* improve highlighters
-
-  - folding support
-
-* markup support in info boxes
-
-* improve insert completion
-
-  - Detect when the following text is matching the inserted completion
-
-  - Support multiple completion points
-    (1.1@0:comp1:comp2:comp3:1.5@0:comp1:comp2:comp3)
-
-* investigate 'kakdiff'
-
-* Tree based undo
-
-* 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
-
-* Improve self-documenting
-
-  - Generate documentation from Kakoune source
-
-    . Write asciidoc from internal documentation
-
-    . make doc compiles kakoune, and run doc generation:
-      +./kak -help commands > ../doc/commands.asciidoc+
-      with README.asciidoc including commands ?
-
-* Comments and strings should be more integrated than just highlighting, matching chars
-  for example should be strings and comments aware (should they ?)
-
-* change command parsing to be more shell like
-  (support -option="value with spaces" instead of requiring "-option=value with spaces")