Version 0.6.0

There have been many changes since the last release, focused on performance, documentation, type safety and profiling. These changes caused a number of API changes and behavioural changes, the most significant of which are listed below.

• Support for newer versions of anyhow.
• Some error messages contain "did you mean" suggestions.
• Addition of a bytecode interpreter, with associated performance gains.
• Constant propagation and speculative execution during compilation.
• Removed mutability around the file loader and set_loader.
• Several new forms of profiling, making use of the new extra_memory function.
• Improved errors from derivations.
• Changes around function invocation, in particular Arguments is now opaque.
• Changes around ConstFrozenString, which is now StarlarkStrN.
• Add OwnedFrozenValue::owner.
• Add derive support for Freeze.
• Add more Starlark typed wrappers, such as StringValue and ValueTyped.
• Make tuples and lists opaque types, with new functions for allocating them (e.g. alloc_tuple).
• Make all Starlark types implement Display in preference to collect_repr.
• Support for documentation annotations on all types.