Support for bindings resolution of using ... for directives

[ggiraldez]

Adds support to resolve identifiers used in the using...for directives, as well as resolving to the attached functions for the types extended by those directives.

Supported features:

• attaching functions to elementary types
• attaching functions to array types
• attaching functions to user defined types
• directives marked with global work
• both library and individual attachments are supported

Limitations/caveats:

• function types are supported but they are not discriminated by parameters/return types (attached functions apply to all function types)
• operators for user-defined types are not yet implemented
• using ... for * is not yet supported

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Latest commit: 0dbba33

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