Split up setup.py and move packaging tools to new script

setup/windows_uninstall.bat

@@ -7,12 +7,12 @@ python --version 2>NUL
 if errorlevel 1 goto errorNoPython
 echo Python found. OK.
 
-if exist setup.py (
-    echo setup.py found. OK.
+if exist pkgutils.py (
+    echo pkgutils.py found. OK.
 ) else (
     cd ..
-    if exist setup.py (
-        echo setup.py found. OK.
+    if exist pkgutils.py (
+        echo pkgutils.py found. OK.
     ) else (
         goto errorNoSetup
     )
@@ -27,7 +27,7 @@ goto afterUninst
 :doUninst
 
 :: Remove the desktop and start menu icons
-python setup.py win-uninstall
+python pkgutils.py win-uninstall
 
 :: Remove the PyQt5 and pyenchant dependencies
 pip uninstall --yes -r requirements.txt
@@ -51,9 +51,9 @@ goto:eof
 
 :errorNoSetup
 echo.
-echo ERROR^: Could not find the setup.py script.
+echo ERROR^: Could not find the pkgutils.py script.
 echo.
-echo Make sure you run setup.py from the novelWriter root folder.
+echo Make sure you run pkgutils.py from the novelWriter root folder.
 echo.
 
 pause