Enhanced Binding/Resolver, Async Call Support

[proboscis]

• We need IBindKey rather than a direct string for custom binding control
• We need a resolver that can handle such binding
• We need a resolver that can handle async instances

[proboscis]

Injected classes can be used as is for now, and can be extended later to be converted to IBindKey functions decorated with @injected @instance can be used as is. What we need to change is :

1. Design class
2. run_injected cli
3. __meta_context__ semantics as it expects Design class rather than newly introduced Blueprint class.

Options:

1. update Design class to hold IBindKey rather than introducing Blueprint This allows us to keep run_injected and __meta_context__ untouched.

So, let's make update Design class definition and make a major version update.

[proboscis]

This has been implemented since v0.2~