Fix auto-completion / content-assist

When using the content assist functionality, the qualified name for e.g. a member of a data type when specifying a data instance is inserted, which in turn is not accepted by the editor.

Given:

Type Response (
  status of type Integer,
  message of type String	
);

Content assist provides the right proposals in the pop-up but selecting e.g. the first one results in:

Response OK(Response.status);

instead of

Response OK(status);

A separate issue should be created for inserting templates including the following "=" and potentially a default proposal for the assigned value.