Editor Syntax Highlighting - Editor stops highlighting syntax errors further down document

[JohnRudden]

When the editor highlights errors in the feature document, such as

sometimes when an additional error is highlighted earlier in the document, the subsequent errors are no longer highlighted

[alistairjevans]

Syntax errors are detected in phase 1 of the compilation process; Feature duplication won't be picked up until phase 2. Looks like we need to allow the compiler to progress past phase 1 if it can, even if it has errors.

Moving to the language repo.