v2.0.0-preview.3

This prerelase update includes the following fixes:

• Filtered out non-person entities in person card organization - #673
• Added Files section and updated Profile section in Person Card - #669
• Fixed cache to cache image state when no image is available - #670
• Updated mgt-react types in package.json from types.d.ts to index.d.ts (thanks @elav000) - #663
• Exporting mgt-element from mgt - #661