Not all features work for files not in a project

[amishne]

Features that don't work:

• Syntax errors
• Quickfix options (probably because context.getXtextDocument() returns null)

[amishne]

Some problems still remain. This is a known problem with Xtext, see:

http://stackoverflow.com/questions/15359321/some-features-of-xtext-based-editor-dont-work-on-files-outside-a-project

Known issues:

• Ctrl-click doesn't work