0.3.0 - Expression Metrics & Refactoring

What's Changed

• Adding Multiple Metric Support & Recursive Logic by @callum-mcdata in #40
• Renaming To Calculate by @callum-mcdata in #46
• Updating Tree Logic by @callum-mcdata in #51
• Grain Validation by @callum-mcdata in #52
• Overhauling Common Dimension List by @callum-mcdata in #53
• V0.3.0 - Metric Function & Overhaul by @callum-mcdata in #37
• Hotfixing Prerelease Bugs by @callum-mcdata in #55
• Fixing Division By Zero and Allowing Expression Secondary Calculations by @callum-mcdata in #57

Full Changelog: 0.2.0...0.3.0