Pieter Wuille 7cedafc541 Add tr() descriptor (derivation only, no signing)
This adds a new descriptor with syntax e.g. tr(KEY,{S1,{{S2,S3},S4})
where KEY is a key expression for the internal key and S_i are
script expression for the leaves. They have to be organized in
nested {A,B} groups, with exactly two elements.

tr() only exists at the top level, and inside the script expressions
only pk() scripts are allowed for now.
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