Moved BitInputStream to ioutils
Added exception handling for visitFile(), since visitFileFailed is apparently not called in this case
ioutils update
Using readStruct
Using submodules for custom library projects
Added support for asset bundle codecs

Fixes #37
Added structs from Xianjian
Added AssetBundleHeader.setCompressed()
Improved saving code to fix bundle codecs
Small improvements
Renamed actions to commands
Merge branch 'master' of github.com:ata4/disunity
Improved command parsing using JCommander
Fixed missing output dir for asset bundles
Using createDirectories instead of createDirectory
Added directory creation
Updated ioutils