+ change key type from uint to int (fixes bugs from negative int_t becoming a junk uint_t value )
+ detect and ignore channels with no keys in the specified take start/stop window
+ add test model with multiple animations
Reasoning: even though the model content of these files is BSD compatible, they carry a Autodesk Copyright Notice after being converted to FBX. I have serious doubts that this could serve as base for claims against us, but better safe than sorry.