Changed the order mip maps are saved in ftexs files to ascending order.
Matched spellings of properties in FtexFileMipMapInfo and FtexsFileChunk.
Refactored Ftex and Ftexs classes to differentiate between different Ftexs files (e.g. .1.ftexs) later on.
Merge branch 'master' of https://github.com/Atvaark/FtexTool.git