[packing] [WIP] Implementation of #packing annotations #239
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This PR adds support for
#packingannotations, including support for concatenation and packing applications, but no support for#solveannotations.The idea is that packing expressions are flattened into a
FlattenedExprform, containing a bit pattern and assignments. TheseFlattenedExpr's can be concatenated or applied to obtain scalar assignments, interval assignments and bit patterns for each variant. These pre-existing constraints are fed into the original solver.Issues: