misc: move station and audio_streams to context_processors (in order to have them available in accounts views)

aircox/context_processors/__init__.py

@@ -0,0 +1,3 @@
+def station(request):
+    station = request.station
+    return {"station": station, "audio_streams": station.streams}

aircox/views/base.py

@@ -50,13 +50,9 @@ class BaseView(TemplateResponseMixin, ContextMixin):
         return None
 
     def get_context_data(self, **kwargs):
-        kwargs.setdefault("station", self.station)
         kwargs.setdefault("page", self.get_page())
         kwargs.setdefault("header_template_name", self.header_template_name)
 
-        if "audio_streams" not in kwargs:
-            kwargs["audio_streams"] = self.station.streams
-
         if "model" not in kwargs:
             model = getattr(self, "model", None) or hasattr(self, "object") and type(self.object)
             kwargs["model"] = model

instance/settings/base.py

@@ -238,6 +238,7 @@ TEMPLATES = [
                 "django.template.context_processors.static",
                 "django.template.context_processors.tz",
                 "django.contrib.messages.context_processors.messages",
+                "aircox.context_processors.station",
             ),
             "loaders": (
                 "django.template.loaders.filesystem.Loader",