* [env] remove crate-level re-exports for the hash module

* [env] rename ink_env::println -> debug_println

This makes the usage intent clearer.

* [lang] remove deprecated method

* [lang] hide all definitions that are only needed for codegen purposes

* [lang] remove False, move True

* [lang] remove unnecessary where bounds

* [lang] add EnvAccess forwarding for built-in crypto hashes

* [README] add ink_lang doc link

* [env] fix on-chain compilation

* [lang] apply clippy suggestion

* [*] split ink_core into ink_env and ink_storage

The workspace does not yet compile!

* [env] make compile again

* [env] fix doc tests

* [storage] make crate compile again

* [env] fix some doc comment links

* [README] flipper example: remove unused import

* [storage/derive] fix compilation of generated code

* [README] add ink_storage and ink_env doc links

* [env, primitives, storage] fix docs

* [lang] make compile again

* [lang/codegen] use absolute paths in #[ink::test] proc. macro

* [examples] make compile again

* [*] apply rustfmt

* [env] remove unneeded dependencies

* [storage] remove all unneeded dependencies and crate features

* [*] update outdated dependencies

* [env, lang] remove unused dependencies

* [*] fix comments

* [*] fix some intra doc links

* [ci] adjust to split ink_env and ink_storage crates

* [ci] forgot to handle split ink_env and ink_storage in docs

* [storage] fix fuzz tests

* [examples] apply rustfmt

* [examples] apply rustfmt (ERC-721)