dsc v0.9.4

This release of Flame/dsc mostly contains bugfixes and a couple of minor improvements. Specifically,

• boxing an enum literal will now indeed result in a boxed enum, rather than a boxed primitive type,
• boxing a char literal will now result in a boxed char instead of a boxed int16 (this was a CLR backend only bug),
• attributes of types that refer to themselves in their base types will no longer be discarded,
• CLR delegates are first-class delegates now; calling .GetIsDelegate() on CLR delegates returns true instead of false, and
• PointerKind has been made thread-safe.