Revert relying on clipboardData html
Revert relying on clipboardData html

When pasting across applications (ex. IE11 -> Chrome) clipboardData html
contains <script> and <style> tags. The browser's native paste resolves
stripping the former and other unnecessary tags (<title>) and applying
appropriate styles to nodes. We should not reimplement all of this.

Fixes #886

sferoze/quilljs,quilljs/quill,tim-mc/quill,voxmedia/quill,voxmedia/quill,willrowe/quill,sferoze/quilljs,quilljs/quill,willrowe/quill,sferoze/quilljs,willrowe/quill,sferoze/quilljs,tim-mc/quill,voxmedia/quill,quilljs/quill