Project cleanup; removed unused resources and test classes. Fixed memory leak bug in DataFetcher.kt

app/src/main/res/layout/content_settings.xml

@@ -4,7 +4,6 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     xmlns:tools="http://schemas.android.com/tools"
-    android:background="@color/colorBackground"
     tools:context=".fragments.SettingsFragment">
 
     <androidx.core.widget.NestedScrollView
@@ -115,7 +114,6 @@
                         style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox.ExposedDropdownMenu"
                         android:layout_width="0dp"
                         android:layout_height="wrap_content"
-                        android:hint="@string/appTheme"
                         android:layout_marginTop="16dp"
                         android:layout_marginStart="8dp"
                         android:layout_marginEnd="8dp"
@@ -128,6 +126,7 @@
                             android:layout_width="match_parent"
                             android:layout_height="wrap_content"
                             android:editable="false"
+                            android:hint="@string/appTheme"
                             android:textColor="@color/colorText"
                             android:textSize="14sp"/>
 
@@ -642,8 +641,7 @@
                         app:layout_constraintBottom_toTopOf="@+id/txtPrivacyP"
                         app:layout_constraintEnd_toEndOf="parent"
                         app:layout_constraintStart_toStartOf="parent"
-                        app:layout_constraintTop_toBottomOf="@+id/txtWhatittook"
-                        android:onClick="onClick"/>
+                        app:layout_constraintTop_toBottomOf="@+id/txtWhatittook"/>
 
                     <TextView
                         android:id="@+id/txtPrivacyP"