feat(api): update imnodes bindings to latest version (#282)

resolve #193
fixes #290

* fix(api): fix imnodes getNode___Pos & generate latest bindings
* fix(api): add optional arguments for ImNodes style methods

imgui-binding/src/main/java/imgui/extension/imnodes/ImNodes.java

@@ -78,13 +78,13 @@ public final class ImNodes {
     // Style presets matching the dear imgui styles of the same name.
 
     @BindingMethod
-    public static native void StyleColorsDark();
+    public static native void StyleColorsDark(@OptArg ImNodesStyle style);
 
     @BindingMethod
-    public static native void StyleColorsClassic();
+    public static native void StyleColorsClassic(@OptArg ImNodesStyle style);
 
     @BindingMethod
-    public static native void StyleColorsLight();
+    public static native void StyleColorsLight(@OptArg ImNodesStyle style);
 
     /**
      * The top-level function call. Call this before calling BeginNode/EndNode. Calling this function
@@ -220,15 +220,21 @@ public final class ImNodes {
 
     @BindingMethod
     public static native void SetNodeGridSpacePos(int nodeId, ImVec2 gridPos);
+    
+    @BindingMethod
+    public static native ImVec2 GetNodeScreenSpacePos(int nodeId);
 
     @BindingMethod
-    public static native void GetNodeScreenSpacePos(int nodeId);
+    public static native ImVec2 GetNodeEditorSpacePos(int nodeId);
 
     @BindingMethod
-    public static native void GetNodeEditorSpacePos(int nodeId);
+    public static native ImVec2 GetNodeGridSpacePos(int nodeId);
 
+    /**
+     * Enable or disable grid snapping.
+     */
     @BindingMethod
-    public static native void GetNodeGridSpacePos(int nodeId);
+    public static native void SnapNodeToGrid(int nodeId);
 
     /**
      * Returns true if the current node editor canvas is being hovered over by the mouse, and is not