refactor: order of version and func_id

[Daanvdplas]

The function extract_env in the chain extension returns four bytes:

let (version, function_id, pallet_index, call_index) = extract_env(&env);

This should become:

let (function_id, version, pallet_index, call_index) = extract_env(&env);

• chain extension changes
• pop api

[Daanvdplas]

closed by #271