Added support for const node inputs.

src/AnimGraph/AnimGraph.h

@@ -23,6 +23,7 @@ struct AnimGraph {
   char* m_input_buffer = nullptr;
   char* m_output_buffer = nullptr;
   char* m_connection_data_storage = nullptr;
+  char* m_const_node_inputs = nullptr;
 
   std::vector<Socket>& getGraphOutputs() { return m_node_descriptor->m_inputs; }
   std::vector<Socket>& getGraphInputs() { return m_node_descriptor->m_outputs; }
@@ -44,6 +45,7 @@ struct AnimGraph {
     delete[] m_input_buffer;
     delete[] m_output_buffer;
     delete[] m_connection_data_storage;
+    delete[] m_const_node_inputs;
 
     for (int i = 0; i < m_nodes.size(); i++) {
       delete m_nodes[i];