Merge pull request #1890 from matrix-org/matthew/slate

Replace Draft with Slate

package.json

@@ -59,9 +59,6 @@
     "classnames": "^2.1.2",
     "commonmark": "^0.28.1",
     "counterpart": "^0.18.0",
-    "draft-js": "^0.11.0-alpha",
-    "draft-js-export-html": "^0.6.0",
-    "draft-js-export-markdown": "^0.3.0",
     "emojione": "2.2.7",
     "file-saver": "^1.3.3",
     "filesize": "3.5.6",
@@ -87,6 +84,10 @@
     "react-beautiful-dnd": "^4.0.1",
     "react-dom": "^15.6.0",
     "react-gemini-scrollbar": "matrix-org/react-gemini-scrollbar#5e97aef",
+    "slate": "0.33.4",
+    "slate-react": "^0.12.4",
+    "slate-html-serializer": "^0.6.1",
+    "slate-md-serializer": "matrix-org/slate-md-serializer#f7c4ad3",
     "sanitize-html": "^1.14.1",
     "text-encoding-utf-8": "^1.0.1",
     "url": "^0.11.0",