Launches Solidity Compiler v0.8.26 with Faster Optimizer

Solidity Compiler v0.8.26 launches with a faster default optimizer via IR pipeline. New require(bool, Error) overload supports custom errors in via IR. Yul optimizer reduces gas by optimizing small error encoding. SMTChecker gains balance check targets and multiple bugfixes improve stability. Commandline fixes handle optimizer disabling errors. JSON library switches to nlohmann::json. Contributors include Alex Beregszaszi and Patrick Collins.