New lemmas for List#1072
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There are a few new lemmas and four new operators:
isprefix: whether one list is a prefix of the other listprefixes: the sets of all prefixes of a listinterval: a consecutive subsequence of a listrfind: reverse finding (start from the end of the list)Also, I reduced smt usage in some old proofs, as smt solving in those proof fails on my machine. I believe these updates only make proofs better :)