Major upgrade to SC5 and latest Styled-System

[designmatty]

Overview

• Upgrade dependency: Styled-Components 5
  • Core
  • TestBed
• Upgrade core dependency: Styled-System See Migration Guide for general overview
  • Replaced theme keys widths, heights, minWidths, maxWidths, minHeights, maxHeights with sizes. Changed in base theme and component themes. (Breaking Change)
  • Fixed previously unknown bug where propType declarations weren't working
    • Installed styled-system/propTypes library
    • defined PROPTYPES in constants.js for use in propType declarations. Utilizes styled-system/propTypes createPropTypes
  • Installed styled-system/themeGet library
    • Fixed previously unknown bug where themeGets wouldn't properly fallback. In some cases this meant utilizing a new feature in styled system
    • In general, I imported ThemeGet as tg to make things a little cleaner.
  • Utilize compose within components see this guide
• Added propTypes to Box
• Swapped in use of styled-systems categories when our styled categories aligned (in constants.js)
• Changed base style of tooltip

Checklist

• [ ] Relevant documentation pages have been created or updated
• [ ] Description of PR is in an appropriate section of the changelog and grouped with similar changes if possible
• [ ] Relevant status has been updated on the status page

Upgrade instructions

If there are any of the following in this PR, provide proper instructions on how to upgrade:

• [ ] Changes to the prop names or types of existing components
• [ ] Changes in intended behavior of existing component props
• [ ] Changes in the theme file's structure
• [ ] A required version bump to a non-dev dependency of the project

Testing Instructions

• It's generally easiest to test everything in the testbed.

Closes #245 Closes #224