* Add special string literals "..."? (s,a,u,h,)
* Add string literal H (256-bit hash)
* Add string literal c (crc32)
* Use td::hex_encode instead of homebrew function and add test
* Fix error codes and use more generic address
* Add support for int and slice constants
* Add support for strongly typed constants
* Add support for precompiled constant expressions (hard!)
Co-authored-by: starlightduck <starlightduck@gmail.com>
