Add enabling/disabling Tweak Store

Author: Blanka Kulik

androidtweakslibrary/src/main/java/no/agens/androidtweakslibrary/models/TweakStore.java

@@ -17,6 +17,7 @@ public class TweakStore {
     public static final String SHARED_PREFERENCES = "sharedPreferences";
     private static TweakStore tweakStore;
     private final String tweakStoreName;
+    private Boolean isEnabled = false;
     private final List<Collection> collections = new ArrayList<>();
     private final SharedPreferences sharedPreferences;
     private final List<Callback> callbacks = new ArrayList<>();
@@ -38,6 +39,14 @@ public static TweakStore getInstance(Context context, String tweakStoreName) {
         return tweakStore;
     }
 
+    public void setEnabled(Boolean value) {
+        isEnabled = value;
+    }
+
+    public Boolean isEnabled() {
+        return isEnabled;
+    }
+
     public void setValue(TweakBoolean tweakBoolean, Boolean value) {
         SharedPreferences.Editor editor = sharedPreferences.edit();
         editor.putBoolean(getTweakBooleanKey(tweakBoolean), value);