Reduce function

[takuya-takeuchi]

ios binary requires to provide functions corresponds to all P/invoke functions.
But it is too many and occurs to make huge binary.
Especially android binary exceeds 2GB.

Therefore I consider to create DlibDotNet-Lite for FaceRecognitionDotNet.
And all binaries are embedded to FaceRecognitionDotNet package.
It means that DlibDotNet package is unlinked from FaceRecognitionDotNet package.
DlibDotNet-Lite packages should not be published.
And binary size make be small and decrease consume of memory.