Feature: UrBackup Widget (#1735)

* Add initial UrBackup widget with counts of ok, errored, and out-of date clients

* Add configurable number of days since last backup before a client is considered out-of-date

* Don't count a lack of recent (or error free) image backup if image backup isn't supported.

* Add support for reporting total disk usage

* add support for "fields" from services.yaml

* fix field filtering, syntax

* Consolidate urbackup code, syntax changes

* Revert pnpm changes

* re-add urbackup-server-api

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Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

public/locales/en/common.json

@@ -686,5 +686,11 @@
         "maxPlayers": "Max players",
         "bots": "Bots",
         "ping": "Ping"
+    },
+    "urbackup": {
+        "ok" : "Ok",
+        "errored": "Errors",
+        "noRecent": "Out of Date",
+        "totalUsed": "Used Storage"
     }
 }