MouseSettings: Add a tab to change cursor theme

Userland/Applications/MouseSettings/Theme.gml

@@ -0,0 +1,39 @@
+@GUI::Frame {
+    fill_with_background_color: true
+
+    layout: @GUI::VerticalBoxLayout {
+        margins: [10, 10, 10, 10]
+    }
+
+    @GUI::GroupBox {
+        title: "Theme"
+
+        layout: @GUI::VerticalBoxLayout {
+            margins: [16, 2, 16, 16]
+        }
+
+        @GUI::Widget {
+            fixed_height: 50
+
+            layout: @GUI::HorizontalBoxLayout {
+                spacing: 10
+                margins: [8, 16, 0, 8]
+            }
+
+            @GUI::Label {
+                text: "Select Theme: "
+                text_alignment: "CenterRight"
+            }
+
+            @GUI::ComboBox {
+                name: "theme_name_box"
+                model_only: true
+            }
+        }
+
+        @GUI::TableView {
+            name: "cursors_tableview"
+            font_size: 12
+        }
+    }
+}