v3.0.0

This release of GSP removes support for the ‘>’ prefix to nodes.  It was
deemed ugly, a hack, and unnecessary.  Instead simply make use of
embedded nodes and the ‘-’-nodes property of not trimming whitespace.

Pre-v3:

    foo {
        >bar{}
        baz{}
    }

v3+:

    foo {-
        @bar{}
        @baz{}
    }

The manuals have also been updated to reflect these changes.
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