HLSL: Wrap the entry-point; need to write 'in' args, and support 'inout' args.
This needs some render testing, but is destined to be part of master. This also leads to a variety of other simplifications. - IO are global symbols, so only need one list of linkage nodes (deferred) - no longer need parse-context-wide 'inEntryPoint' state, entry-point is localized - several parts of splitting/flattening are now localized
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