v3.19.0 release

Enhancements

• SharePoint Framework v1.19.0 support #1857
• DynamicForm: enable/disable save button #1810
• PeoplePicker: add new prop - useSubstrateSearch #1819
• SitePicker: add button to clear single / multiple selection #1839

Fixes

• DynamicForm: more than 100 lookups and date format in lookup field #1722
• Richtext: can not undo ordered lists #1135
• FilePicker: fixing organization tab browsing issue #1861
• PeoplePicker: method to clear the array #1838
• SitePicker: documentation patch #1842

Contributors

Special thanks to our contributors (in alphabetical order): Alex Terentiev, Antanina Druzhkina, Guido Zambarda, Luccas Castro, Michaël Maillot, Niels Söth, srpmtt.