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scope and iscope template functions

- Planned Features26
I'd like to add two new template functions: scope and iscope.

scope is function that will load a template and try to extract it's top level element into a component for the sake of greater performance on the client side.

iscope is like scope, but these are for immutable components which we can reuse rather than having to rebuild all the time. For instance, the blocks in posts with information about the poster.