Use sys.exit instead of exit

The global exit function is designed only for the interpreter, so use
the correct one.

Also fix the plandomizer so it does not immediately error when run.

EntranceRandomizer.py

@@ -3,6 +3,7 @@ import os
 import logging
 import random
 import textwrap
+import sys
 
 from Main import main
 from Gui import guiMain
@@ -191,11 +192,11 @@ if __name__ == '__main__':
     # ToDo: Validate files further than mere existance
     if not args.jsonout and not os.path.isfile(args.rom):
         input('Could not find valid base rom for patching at expected path %s. Please run with -h to see help for further information. \nPress Enter to exit.' % args.rom)
-        exit(1)
+        sys.exit(1)
     if args.sprite is not None and not os.path.isfile(args.sprite):
         if not args.jsonout:
             input('Could not find link sprite sheet at given location. \nPress Enter to exit.' % args.sprite)
-            exit(1)
+            sys.exit(1)
         else:
             raise IOError('Cannot find sprite file at %s' % args.sprite)