Added standard constructor with just scene and name for KRModel and KRCollider.

Implemented KRNode::createNode, to create nodes declared in KrCreateNodeInfo structs.
Added stub function, KRNode::update to update node attributes from a KrNodeInfo struct.

kraken/KRContext.cpp

@@ -793,7 +793,7 @@ KrResult KRContext::createNode(const KrCreateNodeInfo* pCreateNodeInfo)
   }
 
   KRNode* newNode = nullptr;
-  KrResult res = KRNode::createNode(pCreateNodeInfo, &newNode);
+  KrResult res = KRNode::createNode(pCreateNodeInfo, scene, &newNode);
   if (res != KR_SUCCESS) {
     return res;
   }