global refactoring and fixes,

removed support of extracted(aligned) PNG faces. Use old builds to convert from PNG to JPG.

fanseg model file in facelib/ is renamed

samplelib/SampleGeneratorFace.py

@@ -82,6 +82,9 @@ class SampleGeneratorFace(SampleGeneratorBase):
         return self
 
     def __next__(self):
+        if not self.initialized:
+            return []
+            
         self.generator_counter += 1
         generator = self.generators[self.generator_counter % len(self.generators) ]
         return next(generator)