Release v0.7.0

[ascjones]

• Fix deprecation warnings #82
• Use ink 3.0.0-rc1 #82
• [template] now uses ink_env and ink_storage #81
• Update new command template to ink! 3.0 syntax #80
• Extract contract metadata to its own crate #69
• Fix ManifestPath compiler errors #73
• Upgrade cargo-xbuild and other dependencies #71
• Update subxt and async-std dependencies #66
• Generate extended contract metadata #62
• Autogenerate abi/metadata package #58
• Extract workspace to module directory #59
• Add preferred default release profile settings #55
• Add option to build with unmodified original manifest #51
• Update cargo-xbuild #54

[Robbepop]

Awesome!