Started working on graph initialization in ATP Editor.

src/AnimGraph/AnimGraph.cc

@@ -7,6 +7,8 @@
 #include <cstring>
 
 bool AnimGraph::init(AnimGraphContext& context) {
+  context.m_graph = this;
+
   for (size_t i = 2; i < m_nodes.size(); i++) {
     if (!m_nodes[i]->Init(context)) {
       return false;