Hu Chunming / FFNvDecoder

Conflicts:
	.vscode/launch.json
	build/Makefile
	src/demo/main_dvpp.cpp
	src/interface/FFNvDecoderManager.cpp

Conflicts:
	.vscode/launch.json
	src/Makefile
	src/main.cpp

Conflicts:
	src/FFNvDecoder.cpp
	src/Makefile
	src/main.cpp

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# especially if it merges an updated upstream into a topic branch.
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Dev wsl

See merge request !3

2.添加DECODE_FINISHED_CALLBACK
3.添加isPausing接口
4.添加getCachedQueueLength接口
5.添加snapshot和releaseFFImgInfo接口
6.测试代码添加log回调的自定义设置

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