Version 0.2.0

The latest release is now available in ZIP form. Here is an highlight of the new features:

- Added a first version of the documentation
- A new icon with transparent background
- Extended mouse copy
- Can now open external files
- Added a new indentation category/scheme: 'none'. Ideal for PLT-style modules.
- Added a new preference page - Lexical extensions
- Major modifications to the Color preferences (now Appearance page).