Support more texture types about sort HOT 6 CLOSED

Tried CImg, I have no luck of running it smoothly. So I have to drop the idea of using it.

Just added tga support for SORT, works fine.
Jpg, png, hdri are to be supported.
I'll work on it in the next couple of days.

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png is supported right now.

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jpg is supported.

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hdr image reading is done.
Need to work on saving later.

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Putting this issue as a low-priority task.
Since all bmp, exr, jpg, png, tga and hdr images are supported right now, saving a image to hdr file is not that important.

Maybe I should find a better light weight lib like CImg so that I can ignore those parsing things, saving me some time.

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Grab a piece of code from SmallVCM
http://www.smallvcm.com/

Saving to HDR file is done.

Since HDR saving and loading code is relatively small comparing with jpg and png, I'm not sure if it delivers robust quality. A couple of tests showed that it works fine and since this part is far from the core of my renderer, I'm gonna closing this bug now.

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