code cleanup shiboken and pyside (#118)

- Code cleanup qt4 and pyside

engine.py

@@ -955,22 +955,14 @@ def __get_wrap_instance_method(self):
 
         This checks Qt versions in order of:
 
-            1. PySide / shiboken
-            2. PySide2 / shiboken2
-            3. PySide6 / shiboken6
+            1. PySide2 / shiboken2
+            2. PySide6 / shiboken6
 
         This method is currently only necessary to get the VRED main window. If more cases
         arise such that the correct shiboken module is found for the current Qt version, this
         should be provided by the tk-core QtImporter.
         """
 
-        try:
-            from shiboken import wrapInstance
-
-            return wrapInstance
-        except:
-            pass
-
         try:
             from shiboken2 import wrapInstance