Several features

In this MR I'm adding several features.

I know that we should have one MR per feature, but I simply couldn't breakdown my work on different MR. It would take a lot of my time. Sorry in advance for that.

So, in this MR I'm adding the following features:

• Created pytorch database interfaces for WebFace42M, Mobio, MSCeleb, Morph, MEDS, RFW (the last 5 contains demographic information)
• Added 2 annotators. The FaceXZoo face detector and face landmark detector (it contains 106 landmarks).
• Created a bob database for the VGG2 Database (it contains demographic information (gender and race labels)).
• Added some pytorch building blocks

bob/bio/face/annotator/__init__.py

@@ -15,8 +15,8 @@ def bounding_box_to_annotations(bbx):
         A dictionary with topleft and bottomright keys.
     """
     landmarks = {
-        'topleft': bbx.topleft,
-        'bottomright': bbx.bottomright,
+        "topleft": bbx.topleft,
+        "bottomright": bbx.bottomright,
     }
     return landmarks
 
@@ -38,10 +38,11 @@ def min_face_size_validator(annotations, min_face_size=(32, 32)):
     """
     if not annotations:
         return False
-    for source in ('direct', 'eyes', None):
+    for source in ("direct", "eyes", None):
         try:
             bbx = bob.ip.facedetect.bounding_box_from_annotation(
-                source=source, **annotations)
+                source=source, **annotations
+            )
             break
         except Exception:
             if source is None:
@@ -59,6 +60,7 @@ from .bobipfacedetect import BobIpFacedetect
 from .bobipflandmark import BobIpFlandmark
 from .bobipmtcnn import BobIpMTCNN
 from .bobiptinyface import BobIpTinyface
+from .faceX_106landmarks import FaceX106Landmarks, FaceXDetector
 
 
 # gets sphinx autodoc done right - don't remove it
@@ -88,4 +90,4 @@ __appropriate__(
     BobIpTinyface,
 )
 
-__all__ = [_ for _ in dir() if not _.startswith('_')]
\ No newline at end of file
+__all__ = [_ for _ in dir() if not _.startswith("_")]