Changes since 0.5

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### Improvements and features ###

* Whitespace characters are shown with a small symbol in the editor. Spaces get

  a small middle dot, no-break spaces get a line underneath. Tabs are also represented.

* Some improvements have been made to the code documentation.

* The internals have been refactored. The most visible difference is in

  settings handling: systems define the settings they need, instead of having

  this information spread everywhere.

### Languages ###