Version 1.0.0

Refactored the codebase and made some improvements:

• Added typescript type definition file
• Added width and height attributes to allow for non-square icons
• Improved default styling to allow for easier integration
  • Icon is now inline by default
  • SVG is centered within the parent
  • Add vertical-align: middle style to center with text
  • Add size="100%" attribute to allow icon to auto-size with parent
• Changed CSS variables to -icon-* to mitigate styling conflicts from parent elements