Update _bPlaying on CCActionObject.

The method CCActionObject::isPlaying() return the state of the member var _bPlaying,
which is initially declared false and never updated. The change updates this variable
across the play, pause, stop and end states of the action.
use fileName for _actionDic key
SceneReader sets contentSize by canvasSize.

We could not get the canvas size of the scene which created on CocosStudio.

Thanks to this commit, we can get scene's canvas size by Node::getContentSize()

```cpp
auto scene = cocos2d::cocostudio::SceneReader::getInstance()->createNodeWithSceneFile("Scene.json");
int width = scene->getContentSize().width;
int height = scene->getContentSize().height;
cocos2d::log("canvasSize = %d, %d", width, height);
```
Update Reference plugin-x
Update Reference for template
Update reference to plugin
Update reference plugin-x
fix cmakelists.txt of linux platform
Merge branch 'v3' into fixLinuxCompileError
add box2d tinyzml back
fix linux compile error
Sprite3DTest.lua:
Add Sprite3DWithSkinTest
Add AttachmentTest
Add Sprite3DReskinTest
Add Sprite3DMirrorTest
Add Sprite3DHitTest
Finished Sprite3DHitTest
Sprite3DHitTest use BoundingBox
remove '../' at path on android.

because AAssetManager_open do not support '../' in path.
use reference
fix bug: physics crashes when remove/add children too quick.
Scale9Sprite capInsets set fix
scheduler and macro fixes

* kRepeatForever -> CC_REPEAT_FOREVER
* schedule_selector -> CC_SCHEDULE_SELECTOR
* [new] Node::schedule(const std::function<>& callback, const std::string &key)

Updates all smaples