* Utils for writing precompiled contracts
* Precompiled contracts in config, override gas_usage for them
* Add base class for precompiled contracts
* Improve utils for precompiled smc
* Implement GETPRECOMPILEDGAS
* Enable precompiles by flag
* Process null data in PrecompiledSmartContract
* Fix ton_block wasm build
* Fix vm::util::store_(u)long
---------
Co-authored-by: SpyCheese <mikle98@yandex.ru>