A new scheme for se/de values #157
Description
The AIR interpreter both with AVM use serde_json for se/de call_results and call_requests. But serde_json is famous for its memory consumption, that is not so good case for the interpreter compiled to Wasm, because a Wasm memory can't shrink and once increased it will remain this size even if it doesn't needed such memory amount.
Resolves #141.