Implement HDR/PIC format support

[AlexMarinescu]

Parsing and loading .hdr and .pic images. Basically radiance format, a good description of how is structured is found here: http://paulbourke.net/dataformats/pic/

[AlexMarinescu]

I need to look into OpenEXR but I doubt we will make any use of it.

[AlexMarinescu]

Pushed the parser. However there are some bugs that need to be fixed.

[AlexMarinescu]

Cannot get the texture to render. I get weird lines, either the color data is not all loaded properly (ran some checks and for most part it seem alright). Three things that could be at fault, the way the data is being sent to the buffer, the order the colors are in so the shader doesn't account for that or incomplete.