[C++11] Use C++11 threading for faster decoding and encoding images.

[syoyo]

It would be nice if we have multithreaded decoding and encoding with C++11 threading as an optional enhancement

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[syoyo]

Requirement

• TinyEXR still should be compiled with C++03 compiler, so C++11 is still an optional(Use TINYEXR_USE_CPP11 ifdef or similar macro)
• Use C++11 thread STL only(e.g. basically thread, atomic)
• Scanline and Tile images. Not required for deep image.

[syoyo]

Initial work was done in this commit: 7fcdeb4

Introduced TINYEXR_USE_THREAD which is valid when combined with C++11 compiler or later.

[jeffatrad]

I'd also vote for having just a simple plugin system for applications with existing job systems. This is pretty small code delta if you want an example...