Use coroutines for async loading of modules

app/src/main/java/eu/kanade/tachiyomi/AppModule.kt

@@ -11,8 +11,8 @@ import eu.kanade.tachiyomi.data.track.TrackManager
 import eu.kanade.tachiyomi.extension.ExtensionManager
 import eu.kanade.tachiyomi.network.NetworkHelper
 import eu.kanade.tachiyomi.source.SourceManager
-import rx.Observable
-import rx.schedulers.Schedulers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
 import uy.kohesive.injekt.api.*
 
 class AppModule(val app: Application) : InjektModule {
@@ -43,20 +43,16 @@ class AppModule(val app: Application) : InjektModule {
 
         // Asynchronously init expensive components for a faster cold start
 
-        rxAsync { get<PreferencesHelper>() }
+        GlobalScope.launch { get<PreferencesHelper>() }
 
-        rxAsync { get<NetworkHelper>() }
+        GlobalScope.launch { get<NetworkHelper>() }
 
-        rxAsync { get<SourceManager>() }
+        GlobalScope.launch { get<SourceManager>() }
 
-        rxAsync { get<DatabaseHelper>() }
+        GlobalScope.launch { get<DatabaseHelper>() }
 
-        rxAsync { get<DownloadManager>() }
+        GlobalScope.launch { get<DownloadManager>() }
 
     }
 
-    private fun rxAsync(block: () -> Unit) {
-        Observable.fromCallable { block() }.subscribeOn(Schedulers.computation()).subscribe()
-    }
-
 }