v0.3.4: London

This release brings out the Soroban target support, updates llvm to version 16, and fixes many smaller bugs.

Added

• Soroban Support for Stellar Asset Contract(SAC)
• Soroban Support for Cross Contract Calls
• Soroban Support for Soroban Authorization Framework
• Soroban Support for different Soroban Storage types
• Soroban Work on adding support for Stellar's Soroban contracts platforms started, by adding a skeleton that supports the Soroban runtime. Salaheldin Soliman
• The string.concat() and bytes.concat() builtin functions are supported. seanyoung
• Experimental: Three address code format IR for the CFG has been implemented (disabled by default).
  fanyi-zhao.
• Polkadot: Compatibility with ink! v5.0 metadata and substrate-contracts-node v0.39.0
• Implement event selectors seanyoung
• Add a feature flag for compiling language server xermicus
• Parsing the pragma solidity version numbers, making this information available in the downstream
  compilation pipeline seanyoung

Changed

• Polkadot/BREAKING: Event encoding and topics follow ink! v5.0
• BREAKING The non-standard extension of concatenating strings using the + operator
  has been removed, use string.concat() instead. seanyoung
• Removed the --no-log-api-return-codes compile flag as this is now done by the runtime xermicus
• Solana/BREAKING: Remove balance, transfer, and send builtins from Solana LucasSte
• No longer support numbers in octal notation seanyoung
• Moved to LLVM version 16 seanyoung
• Improve overloaded function call diagnostics: From Solidity 0.6 onwards, overloaded functions or events
  resolving to multiple candidates are an error. In earlier versions, the first result is used.
  seanyoung
• Polkadot: Implement the caller_is_root runtime API as a builtin xermicus

Fixed

• Two Infinite loops in codegen, thanks to @smoelius.
• Handle abi.encode() with infinite empty arguments, thanks to @smoelius.
• Unreachable code, function types with parameter/return names and unknown assembly flags are warnings
  instead of errors, matching with solc. xermicus
• Fixed a bunch of typos in the documentation divdeploy
• Clean up the LLD linker context after linking each contract, preventing potential issues when compiling
  multiple contracts at once. xermicus
• Expression statement should be followed by a semicolon, fixing a bug where "_;" was incorrectly parsed
  as a variable. seanyoung
• Represent type(T) correctly in the AST, fixing various related issues seanyoung
• Fix a bug in abi.encodeCall() argument parsing when there is only a single argument seanyoung
• Fixed a codegen bug when the RHS of a shift expression is a struct member PaddyClark0

Full Changelog: v0.3.3...v0.3.4