refactor: use ngx-logger instead of @openstapps/logger

Closes #71

src/app/app.module.ts

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2018, 2019 StApps
+ * Copyright (C) 2018-2020 StApps
  * This program is free software: you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
  * Software Foundation, version 3.
@@ -23,7 +23,8 @@ import {StatusBar} from '@ionic-native/status-bar/ngx';
 import {IonicModule, IonicRouteStrategy} from '@ionic/angular';
 import {TranslateLoader, TranslateModule} from '@ngx-translate/core';
 import {TranslateHttpLoader} from '@ngx-translate/http-loader';
-import {fakeBackendProvider} from './_helpers/fake-backend.interceptor';
+import {LoggerModule, NgxLoggerLevel} from 'ngx-logger';
+import {environment} from '../environments/environment';
 import {AppRoutingModule} from './app-routing.module';
 import {AppComponent} from './app.component';
 import {ConfigModule} from './modules/config/config.module';
@@ -31,7 +32,7 @@ import {DataModule} from './modules/data/data.module';
 import {MenuModule} from './modules/menu/menu.module';
 import {SettingsModule} from './modules/settings/settings.module';
 import {StorageModule} from './modules/storage/storage.module';
-import {environment} from './../environments/environment';
+import {fakeBackendProvider} from './_helpers/fake-backend.interceptor';
 
 registerLocaleData(localeDe);
 
@@ -80,6 +81,8 @@ const providers : Provider[] = [
         useFactory: (createTranslateLoader),
       },
     }),
+    // use maximal logging level when not in production, minimal (log only fatal errors) in production
+    LoggerModule.forRoot({level: environment.production ? NgxLoggerLevel.FATAL : NgxLoggerLevel.TRACE}),
   ],
   providers:
     environment.use_fake_backend ? [providers, fakeBackendProvider] : providers,