Added koin, databinding and navigation components

Converted App class and Main activity to Kotlin. With that refactored fields within App class to allow lazy initialization

BEWARE: at this point the navigation is very much broken, won't let you anywhere beyond home screen

app/src/main/java/com/topjohnwu/magisk/ui/base/BaseActivity.java

@@ -153,7 +153,7 @@ public abstract class BaseActivity extends AppCompatActivity implements Event.Au
     @Override
     public SharedPreferences getSharedPreferences(String name, int mode) {
         if (TextUtils.equals(name, getPackageName() + "_preferences"))
-            return app.prefs;
+            return app.getPrefs();
         return super.getSharedPreferences(name, mode);
     }
 }

app/src/main/java/com/topjohnwu/magisk/ui/base/BasePreferenceFragment.java

@@ -28,14 +28,14 @@ public abstract class BasePreferenceFragment extends PreferenceFragmentCompat
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         View v = super.onCreateView(inflater, container, savedInstanceState);
-        app.prefs.registerOnSharedPreferenceChangeListener(this);
+        app.getPrefs().registerOnSharedPreferenceChangeListener(this);
         Event.register(this);
         return v;
     }
 
     @Override
     public void onDestroyView() {
-        app.prefs.unregisterOnSharedPreferenceChangeListener(this);
+        app.getPrefs().unregisterOnSharedPreferenceChangeListener(this);
         Event.unregister(this);
         super.onDestroyView();
     }

app/src/main/java/com/topjohnwu/magisk/ui/base/MagiskActivity.kt

@@ -0,0 +1,8 @@
+package com.topjohnwu.magisk.ui.base
+
+import androidx.databinding.ViewDataBinding
+import com.skoumal.teanity.view.TeanityActivity
+
+
+abstract class MagiskActivity<ViewModel : MagiskViewModel, Binding : ViewDataBinding> :
+    TeanityActivity<ViewModel, Binding>()

app/src/main/java/com/topjohnwu/magisk/ui/base/MagiskFragment.kt

@@ -0,0 +1,8 @@
+package com.topjohnwu.magisk.ui.base
+
+import androidx.databinding.ViewDataBinding
+import com.skoumal.teanity.view.TeanityFragment
+
+
+abstract class MagiskFragment<ViewModel : MagiskViewModel, Binding : ViewDataBinding> :
+    TeanityFragment<ViewModel, Binding>()

app/src/main/java/com/topjohnwu/magisk/ui/base/MagiskViewModel.kt

@@ -0,0 +1,6 @@
+package com.topjohnwu.magisk.ui.base
+
+import com.skoumal.teanity.viewmodel.TeanityViewModel
+
+
+abstract class MagiskViewModel : TeanityViewModel()