Updated Freestyle API modules according to the new hierarchical package structure.

Additional bug fixes were also done along with the code updates:
* Fix for the use of old Interface1D.pointsBegin() and .pointsEnd() method names
in the definition of pyDensityAnisotropyF1D and pyViewMapGradientNormF1D.
* Fix for wrong data types (int instead of bool) for:
- pyChainSilhouetteGenericIterator constructor and its .orientation property in
modules/freestyle/chainingiterators.py.
- SpatialNoiseShader constructor in styles/external_contour_sketchy.py.
- ChainSilhouetteIterator constructor in styles/multiple_parameterization.py.

release/scripts/freestyle/styles/split_at_tvertices.py

@@ -21,10 +21,20 @@
 #  Date     : 04/08/2005
 #  Purpose  : Draws strokes that starts and stops at Tvertices (visible or not)
 
-from freestyle import ChainSilhouetteIterator, ConstantThicknessShader, IncreasingColorShader, \
-    Nature, Operators, QuantitativeInvisibilityUP1D, TextureAssignerShader, TrueUP1D
-from PredicatesU0D import pyVertexNatureUP0D
-from logical_operators import NotUP1D
+from freestyle import Operators
+from freestyle.types import Nature
+from freestyle.chainingiterators import ChainSilhouetteIterator
+from freestyle.predicates import (
+    NotUP1D,
+    QuantitativeInvisibilityUP1D,
+    TrueUP1D,
+    pyVertexNatureUP0D,
+    )
+from freestyle.shaders import (
+    ConstantThicknessShader,
+    IncreasingColorShader,
+    TextureAssignerShader,
+    )
 
 Operators.select(QuantitativeInvisibilityUP1D(0))
 Operators.bidirectional_chain(ChainSilhouetteIterator(), NotUP1D(QuantitativeInvisibilityUP1D(0)))