Christoph Herzog 3360118040 Refactor AssistBuilder to manage a SourceChange
`AssistBuilder`` now managaes a full `SourceChange` instead of a
Vec<SourceFileEdit>.

This prepares AssistBuilder to handle creation of new files.
2020-07-07 12:10:18 +02:00
..
2020-03-24 10:43:22 +02:00