Revert "only provide reference to edge weight"

This reverts commit 29586b3.

dasp_graph/src/node/mod.rs

@@ -94,7 +94,7 @@ pub trait Node<W = ()> {
 pub struct Input<W = ()> {
     buffers_ptr: *const Buffer,
     buffers_len: usize,
-    edge_weight: W,
+    pub edge_weight: W,
 }
 
 impl<W> Input<W> {
@@ -116,11 +116,6 @@ impl<W> Input<W> {
         // alive.
         unsafe { std::slice::from_raw_parts(self.buffers_ptr, self.buffers_len) }
     }
-
-    /// A reference to the input's edge weight.
-    pub fn edge_weight(&self) -> &W {
-        &self.edge_weight
-    }
 }
 
 // Inputs can only be created by the `dasp_graph::process` implementation and only ever live as