[Development] Imageformats v2

Иван Комиссаров abbapoh at gmail.com
Fri May 22 11:48:34 CEST 2015

For now, i moved mipmaps into ImageResource
+ the Document is just an array of resources now (with 1 element for jpeg,
png, ico, icns; multiple for gif)
+ in the simplest case (jpeg, png) Document has 1 Resource with 1 image in
+ in the case of icns/ico Resource is a 1d array of mipmaps
- in the complex case of DDS Resource is a 2D array. Well, DDS is complex
- reading DDS is a bit weird - we can't read parts of document separately
as Mipmaps are on the top level.
+ still, we can read Gif incrementally

Code is located in mipmaps branch
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