endpoint: /api/trim

- Define new api endpoint /api/trim, params: file_uuid, overwrites exisiting file on server with trimmed audio.
- Remove print messages in freqsplit/postprocessing/audio_writer.export_audio()
- Add new file api/utils.py for commonly used functions

api/backend/urls.py

@@ -18,9 +18,11 @@ from django.contrib import admin
 from django.urls import path
 from api.views import upload_audio
 from api.views import normalize_audio
+from api.views import trim_audio
 
 urlpatterns = [
     path('admin/', admin.site.urls),
     path('api/upload', upload_audio, name='upload_audio'),
-    path('api/normalize', normalize_audio, name="normalize_audio")
+    path('api/normalize', normalize_audio, name="normalize_audio"),
+    path('api/trim', trim_audio, name='trim_audio')
 ]