PyDoc: use Python's type annotation syntax for doc-strings

Replace plain-text type information with the type syntax used
for Python's type annotations as it's more concise, especially for
callbacks which often didn't include useful type information.

Note that this change only applies to inline doc-strings,
generated doc-strings from RNA need to be updated separately.

Details:

- Many minor corrections were made when "list" was incorrectly used
  instead of "sequence".
- Some type information wasn't defined in the doc-strings and has been
  added.
- Verbose type info would benefit from support for type aliases.

source/blender/freestyle/intern/python/BPy_Operators.cpp

@@ -527,7 +527,7 @@ PyDoc_STRVAR(
     "      transform as a stroke.\n"
     "   :type pred: :class:`UnaryPredicate1D`\n"
     "   :arg shaders: The list of shaders used to shade the strokes.\n"
-    "   :type shaders: list of :class:`StrokeShader`");
+    "   :type shaders: list[:class:`StrokeShader`]");
 
 static PyObject *Operators_create(BPy_Operators * /*self*/, PyObject *args, PyObject *kwds)
 {