Add license to readme files

Updated pak file loader for UE4.27+

Retargeting additions

- Stubs for remaining 2 retargeting modes
- Implemented AnimationScaled mode

Added Visual Studio project files.

Suitable for VS2017+ when opening using "Open Folder" command.

Git migration:

- updated line endings
- added gitignore
- fixed warning in Unreal/Shaders/make.pl