sc 0.64.2, chain 0.21.2, sdk 0.14.2

• Workaround for mBufferFromBigIntSigned VM hook bug:
  • The hook was incorrectly converting negative numbers to their absolute value;
  • The mBufferToBigIntSigned VM hook has been added to the deprecated hooks list;
  • Fixed a related bug in the Rust VM, also pertaining to negative numbers, in mb_to_small_int_signed(mBufferFromSmallIntSigned).
• VM: added ESDT metadata recreate and metadata update mock built-in functions.
• Upgraded multiversx-chain-vm-executor to v0.5.1.
  • Contains upgrade to Wasmer 6.1.0 (wasmer-experimental);
  • This fixes and issue with wasmer-prod and wasmer-experimental builds on Linux for certain versions of Rust.
• Big number improvements:
  • BigInt/BigUint proportion and into_proportion methods, for computing self * part / total efficiently, with overflow checks.
  • BigUint::into_non_zero_or_panic method.
  • BigUint::new_unchecked unsafe constructor from BigInt.
  • BigInt::overwrite_i64 now takes &mut self instead of &self.
• New FungiblePayment type, representing a payment with a TokenId and a NonZeroBigUint amount (no nonce). Includes ManagedVecItem, TypeAbi, and codec implementations.
• sc-meta improvements:
  • Added --locked CLI flag support;
  • Build error messages now include the full command that was executed.
• Storage mapper documentation improvements across all mappers.
• Derive substitution list fix: Ref and ManagedVecRef no longer incorrectly listed as having an API generic.