Use 1.x preference abstraction (#8020)

* Use 1.x preference abstraction

- Uses SharedPreferences compared to 1.x impl which uses DataStore but it breaks all settings screens currently
- Move PreferencesHelper to new PreferenceStore
  - PreferencesHelper should be split into smaller preference stores and be in core or domain
- Remove flow preferences as new PreferenceStore handles changes for us

Co-authored-by: inorichi <3521738+inorichi@users.noreply.github.com>

* Fix PreferenceMutableState not updating

* Fix changes not emitting on first subscription

Co-authored-by: inorichi <3521738+inorichi@users.noreply.github.com>

app/src/main/java/eu/kanade/tachiyomi/data/track/TrackService.kt

@@ -69,9 +69,9 @@ abstract class TrackService(val id: Long) {
         get() = getUsername().isNotEmpty() &&
             getPassword().isNotEmpty()
 
-    fun getUsername() = preferences.trackUsername(this)!!
+    fun getUsername() = preferences.trackUsername(this).get()
 
-    fun getPassword() = preferences.trackPassword(this)!!
+    fun getPassword() = preferences.trackPassword(this).get()
 
     fun saveCredentials(username: String, password: String) {
         preferences.setTrackCredentials(this, username, password)

app/src/main/java/eu/kanade/tachiyomi/data/track/mangaupdates/MangaUpdates.kt

@@ -99,6 +99,6 @@ class MangaUpdates(private val context: Context, id: Long) : TrackService(id) {
     }
 
     fun restoreSession(): String? {
-        return preferences.trackPassword(this)
+        return preferences.trackPassword(this).get()
     }
 }