Add IsSquare method + small CMov bugfix · Autarkysoft/Denovo@2f7e898

Build: Src/Autarkysoft.Bitcoin/Blockchain/TransactionVerifier.cs#L404

'UInt256_10x26.EqualsVar(in UInt256_10x26)' is obsolete: 'Removed from libsecp256k1'

Build: Src/Autarkysoft.Bitcoin/Cryptography/EllipticCurve/Calc.cs#L213

'PrivateKey' is obsolete

Build: Src/Autarkysoft.Bitcoin/Cryptography/EllipticCurve/Calc.cs#L213

'PrivateKey' is obsolete

Build: Src/Autarkysoft.Bitcoin/Cryptography/EllipticCurve/DSA.cs#L428

'Scalar8x32.Inverse_old()' is obsolete: 'Use Inverse() instead.'

Build: Src/Autarkysoft.Bitcoin/Cryptography/EllipticCurve/DSA.cs#L517

'Scalar8x32.InverseVar_old()' is obsolete: 'Use InverseVar() instead.'

Build: Src/Autarkysoft.Bitcoin/Cryptography/EllipticCurve/DSA.cs#L529

'UInt256_10x26.EqualsVar(in UInt256_10x26)' is obsolete: 'Removed from libsecp256k1'

Build: Src/Autarkysoft.Bitcoin/Cryptography/EllipticCurve/DSA.cs#L552

'Scalar8x32.InverseVar_old()' is obsolete: 'Use InverseVar() instead.'

Build: Src/Autarkysoft.Bitcoin/Cryptography/EllipticCurve/DSA.cs#L619

'UInt256_10x26.EqualsVar(in UInt256_10x26)' is obsolete: 'Removed from libsecp256k1'

Build: Src/Autarkysoft.Bitcoin/Cryptography/EllipticCurve/Point.cs#L223

'UInt256_10x26.EqualsVar(in UInt256_10x26)' is obsolete: 'Removed from libsecp256k1'

Build: Src/Autarkysoft.Bitcoin/Cryptography/EllipticCurve/PointJacobian.cs#L546

'UInt256_10x26.EqualsVar(in UInt256_10x26)' is obsolete: 'Removed from libsecp256k1'

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