1. Make prologue be exactly the same as regular CheckMultisig.
2. But instead of "SYSCALL System.Crypto.CheckMultisig" do INITSLOT and K check.
3. This makes all of the code from INITSLOT below be independent of N/M, so
one can parse the script beginning in the same way CheckMultisig is parsed and
then just compare the rest of it with some known-good blob.
4. The script becomes a tiny bit larger now, but properties above are too good.
Signed-off-by: Roman Khimov <roman@nspcc.ru>
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
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