Positioned space functionality and custom resize handles

• Created <Positioned /> space #60
• Allow 'as' property to be Polymorphic (to play with libraries like Framer Motion) #89
• Custom resize handles #97
• Added allowOverflow property on spaces to allow contents to overflow space boundary
• Added useCurrentSpace() hook and deprecated <Space.Info />
• Refactored resize logic and added drag logic to support movable <Positioned /> space
• Increased test coverage
• Updated docs
• Upgraded storybook
• Upgraded rollup/build packages

Storybook upgrade

• Upgraded storybook to 6.3.2

Fixed maximumSize constraint functionality

• Corrected erroneous falsy check when determining limits during resize operation

Fixed location of change log and pull releases via GitHub

• Fixed URL of version history in changelog.md
• Removed version history from storybook docs
• History auto updates at allaneagle.com/projects/react-spaces/history from GitHub release via GitHub API

CI / build / deployment improvements for package and storybook docs

• Setup gitversion semantic versioning on Azure Pipeline
• Ensure storybook package automatically created for automatic inclusion on allaneagle.com

Allow React v17 to be used as a peer dependency

• Include React v17 as well as v16 as peer dependency

Storybook upgrade + npm audit fix

• Storybook upgrade
• npm audit fix

Revised global state implementation / optimisations / bug fixes

• Major refactor of library to fix React state side effect issues
• Added tests to library for core functionality
• Revised resize handle placement/functionality

See here for release notes

Upgraded to storybook 6.1.11 + tests fix

• Upgraded storybook to 6.1.11
• Revised tests to pass with new inner/outer mark-up for spaces
• Fix application of overflow to inner space element for scrollable spaces

Added default anchor ordering + resize handle fixes

• Added default anchor ordering when order property not specified on anchored spaces to match live functionality
• Remove styling added to touch handles for testing