Button addition

Added a button for "Habit reset" at the settings xml file. The gradle.properties remains the same.

android/gradle.properties

@@ -16,3 +16,5 @@ org.gradle.daemon=true
 org.gradle.jvmargs=-Xms2048m -Xmx2048m -XX:MaxPermSize=2048m
 android.useAndroidX=true
 android.enableJetifier=true
+
+kapt.incremental.apt=true

android/uhabits-android/src/main/res/xml/preferences.xml

@@ -125,6 +125,11 @@
                 android:title="@string/import_data"
                 app:iconSpaceReserved="false" />
 
+        <Preference
+            android:key="resetHabits"
+            android:title="Reset Habits"
+            app:iconSpaceReserved="false" />
+
     </PreferenceCategory>
 
     <PreferenceCategory