REMOVE support for basic-prepare-op, cl-reading-op
Undo all changes that implement basic-prepare-op, cl-reading-op, and binding of syntax around perform'ance of cl-reading-op. Note that these changes depend on with-action-context, which was reverted in the previous commit regarding per-system variable bindings. These reversals are made in view of making a minimal change towards syntax control, and may be reversed again in some future. A rollback of this commit is expected at some indefinite point in the future.
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