Optionally scale images when sending

Default is "scale". Currently scales image so that longest side is 640px.

package.json

@@ -12,8 +12,11 @@
     "axios": "^0.21.0",
     "clean-insights-sdk": "^2.4.1",
     "core-js": "^3.6.5",
+    "data-uri-to-buffer": "^3.0.1",
     "dayjs": "^1.10.3",
     "fix-webm-duration": "^1.0.0",
+    "image-resize": "^1.1.5",
+    "image-size": "^1.0.0",
     "intersection-observer": "^0.11.0",
     "js-sha256": "^0.9.0",
     "json-web-key": "^0.4.0",
@@ -22,6 +25,7 @@
     "matrix-js-sdk": "^9.4.1",
     "md-gum-polyfill": "^1.0.0",
     "olm": "https://packages.matrix.org/npm/olm/olm-3.2.1.tgz",
+    "pretty-bytes": "^5.6.0",
     "qrcode": "^1.4.4",
     "raw-loader": "^4.0.2",
     "recordrtc": "^5.6.2",