Face/Head segmentation tool update

Just released an update to the face/head segmentation tool. Unfortunately still Windows only but a Linux/Mac version is coming as soon as possible.

This update has some major improvements in the pre-segmentation. The segmentation network has been optimized heavily and produces far better results in difficult cases, see pictures below:

Example of face.head segmentation in V0.15
Example of face/head segmentation in V0.15
Example of face.head segmentation in V0.16
Example of face/head segmentation in V0.16
Example of face.head segmentation in V0.15
JCVD in face/head segmentation in V0.15
Example of face.head segmentation in V0.16
JCVD in face/head segmentation in V0.16

Additional the facial landmark polygon option now includes a polygon covering major parts of the overall face shape. Should be especially helpful to speed-up the labeling process for the NON-CUDA/CUDNN version