sc 0.54.0, sdk 0.7.0, chain 0.11.0

• New crate, multiversx-chain-core, to be used in both framework and Rust VM. It contains common types, flags, and constants that refer to the protocol.
• Major SDK/interactor refactor:
  • Added support for Chain Simulator in interactors:
    • Added chain-simulator-specific endpoints: feed account, advance blocks
    • Added a system to set up accounts in the chain simulator from the interactor;
    • Support for advancing blocks in the interactor;
  • Split SDK crate into:
    • multiversx-sdk - only contains the specifications of the gateway API, without a mechanism to call the API;
    • multiversx-sdk-http - functionality to call the gateway via reqwest;
    • multiversx-sdk-dapp - functionality to call the gateway via wasm-bindgen, to be used in WebAssembly front-ends;
  • Major improvements in the retrieving of transactions and other blockchain data fron the API, many bugs fixed;
  • Support for writing integration tests for interactors, using the Chain Simulator;
    • Also added support for test-related chain-simulator-tests feature flag in sc-meta;
  • Interactors on the front-end:
    • Interactor type made generic over the gateway API implementation, so that it can be used in both front-end and back-end, with no change in the code base;
    • Support for custom random number generation for the front-end;
  • Mechanism for fixing file paths in the interactor context;
  • Fixed an issue with the account tool;
  • Adjusted sc-meta snippets for the new syntax and the chain simulator support;
• Unified syntax:
  • ReturnsHandledOrError result handler, which can gracefully deal with failed transactions;
  • ReturnsGasUsed result handler;
  • PassValue result handler for providing a closure-like context for multi-transaction call/deploy;
  • More specific back transfer result handlers: ReturnsBackTransfersEGLD, ReturnsBackTransfersMultiESDT, ReturnsBackTransfersSingleESDT;
  • Fixed an issue with the update functionality not being general enough;
  • Deprecated prepare_async(), developers can now call run() directly, asynchronously;
• sc-meta improvements:
  • New mechanism for detecting and warning about storage writes in readonly endpoints, integrated into the build system;
  • Support for referencing the framework via git commit, branch, or tag, to make it easier to try out unreleased versions;
  • Support for default-features;
  • Better representation in console of the contract/lib folders, as well as better error messages.
  • Refactoring of the dependency handling logic.
• Fixed the debugger, following changes in the Rust debug tooling.
• ManagedVec set always consumes ownership. Preparations for a profound memory management cleanup.
• ABI:
  • title field and annotation;
  • Refactoring.