Release v21.6.2

Changed

• Generating from a single project now reads every project it references as well, instead of only the project named. An application whose events, commands and concepts live in contracts projects below the one named no longer generates a document that leaves all of them out (#2521)

Fixed

• Generating a Screenplay document no longer fails with SyntaxTree is not part of the compilation on an application written as several projects. A scenario naming a value another project declares - a sentinel identity, a well known identity, a member of an enumeration - is now read through the project that actually holds it, so it is recognized for what it is instead of taking generation down with it (#2521)
• A value a scenario states that no handed-over project declares is now left unrecovered and reported, rather than throwing (#2521)