Find out how RichTextBox works and use that for highlighting etc, or creating own TextBox

[MathiasLui]

We want to autocomplete commands, or mark things so maybe create own editor with RichTextBox or find a good one to use.

• Also being able to edit the config title

[MathiasLui]

Update: We probably want to use AvalonEdit => http://avalonedit.net/ which also has a NuGet package.