Feature/updates screen use infinite swr hook (#303)

* Use "RequestManager" for loading updates

* [Cleanup] Fix typing

* Memoize grouped updates

* [TSConfig] Increase target version

Makes it possible to iterate over a "IterableIterator" (e.g. [...<Map>.entries()])

* Use "GroupedVirtuoso" for "Updates" screen

* Optionally use "padding" instead of margin for the loading placeholder

In case the loading placeholder gets used in a "react-virtuoso" list, the margin might cause issues with the calculated height.

* Use "padding" instead of "margin"

"Margin" breaks "react-virtuosos" height calculation

* Add background color to group header

With virtuoso the group headers are sticky, thus, a background color is needed

* Simplify "groupByDate" object structure

It's not necessary to save the items inside the group object

tsconfig.json

@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     "baseUrl": "./src",
-    "target": "es5",
+    "target": "es2015",
     "lib": [
       "dom",
       "dom.iterable",