MediaInput: Rename streams access methods.

Change MediaInput::footage() to MediaInput::stream() and
MediaInput::SetFootage() to MediaInput::SetStream() as they access
streams not footage.

Also update all instances of access methods to reflect this change.

app/node/input/media/media.cpp

@@ -40,14 +40,14 @@ QList<Node::CategoryID> MediaInput::Category() const
   return {kCategoryInput};
 }
 
-StreamPtr MediaInput::footage()
+StreamPtr MediaInput::stream()
 {
   return footage_input_->get_standard_value().value<StreamPtr>();
 }
 
-void MediaInput::SetFootage(StreamPtr f)
+void MediaInput::SetStream(StreamPtr s)
 {
-  footage_input_->set_standard_value(QVariant::fromValue(f));
+  footage_input_->set_standard_value(QVariant::fromValue(s));
 }
 
 bool MediaInput::IsMedia() const

app/node/input/media/media.h

@@ -40,8 +40,8 @@ public:
 
   virtual QList<CategoryID> Category() const override;
 
-  StreamPtr footage();
-  void SetFootage(StreamPtr f);
+  StreamPtr stream();
+  void SetStream(StreamPtr s);
 
   virtual bool IsMedia() const override;