v0.7.0

[0.7.0] - 2021-03-03

Added

• ErgoScript compiler pipeline draft (ergoscript-compiler crate) and added a feature(default) "compiler" in ergo-lib with compiler exposed via Contract::compile(source);
• ErgoTree:to_base16_bytes() returns Base16-encoded serialized bytes;

Changed

• Extract Ergotree IR with serialization from ergo-lib crate into ergotree-ir crate;
• Extract ErgoTree IR interpreter from ergo-lib crate into ergotree-interpreter crate;