Implement data clean-up dialog (#4072)

* [wip] Add user data cleanup service

* Add clean-up report viewer

* Fix review comments

* Add function comments

* Implement item actions

* Fix UI styles

* Add placeholder for empty results, update category description view

* Add displayEmptyPlaceholder method to show message when results list is empty

* Adjust menu buttons row

* Delete char-scoped data bank attachments on character deletion

* Data Bank: Handle character attachments on rename

* Remove line breaks in description strings

* Drop the category when the last item is deleted

* Skip invalid hashes instead of bailing

public/scripts/templates/dataMaidDialog.html

@@ -0,0 +1,25 @@
+<div class="dataMaidDialog">
+    <div class="dataMaidDialogHeader">
+        <div class="dataMaidHeaderInfo info-block warning margin0">
+            <small data-i18n="Once deleted, the files will be gone forever!">
+                Once deleted, the files will be gone forever!
+            </small>
+            <br>
+            <small data-i18n="Make sure to back up your data in advance.">
+                Make sure to back up your data in advance.
+            </small>
+        </div>
+        <button class="menu_button menu_button_icon dataMaidStartButton">
+            <i class="fa fa-cog"></i>
+            <span data-i18n="Scan">Scan</span>
+        </button>
+    </div>
+    <hr>
+    <div class="dataMaidPlaceholder" data-i18n="No results yet. Tap 'Scan' to start scanning.">
+        No results yet. Tap 'Scan' to start scanning.
+    </div>
+    <div class="displayNone dataMaidSpinner">
+        <i class="fa-solid fa-spinner fa-spin fa-3x"></i>
+    </div>
+    <div class="dataMaidResultsList"></div>
+</div>