sc 0.41.0, vm 0.3.0

• Fixed compatibility with rustc v1.71.0.
• Allocator system:
  • Contracts can now choose their own allocator. This works in multi-contract contexts.
  • New allocators: fail (default), static64k, leaking.
  • Removed dependency to wee_alloc, but using it is still possible if the contract references it directly.
  • Contract call stack size is now configurable in multicontract.toml.
  • The 'panic with message' system now relies on managed buffers instead of on an allocator.
• Fixed BigUint bitwise operations in the debugger.
• When building contracts, an additional .mxsc.json file is created, which packs both the contract binary, the ABI, and some additional metadata.
• Refactor: reorganized the meta crate.
• Deprecated some legacy methods in the API wrappers.