[cli/utils] Remove custom subparser (no longer required)

Apparently this was *never* required? I just didn't know?

Genuinely I have no idea what made me add this.

legendary/cli.py

@@ -23,7 +23,6 @@ from legendary.models.exceptions import InvalidCredentialsError
 from legendary.models.game import SaveGameStatus, VerifyResult, Game
 from legendary.utils.cli import get_boolean_choice, get_int_choice, sdl_prompt, strtobool
 from legendary.utils.crossover import *
-from legendary.utils.custom_parser import AliasedSubParsersAction
 from legendary.utils.env import is_windows_mac_or_pyi
 from legendary.utils.eos import add_registry_entries, query_registry_entries, remove_registry_entries
 from legendary.utils.lfs import validate_files, clean_filename
@@ -2351,7 +2350,6 @@ class LegendaryCLI:
 
 def main():
     parser = argparse.ArgumentParser(description=f'Legendary v{__version__} - "{__codename__}"')
-    parser.register('action', 'parsers', AliasedSubParsersAction)
 
     # general arguments
     parser.add_argument('-H', '--full-help', dest='full_help', action='store_true',

legendary/utils/custom_parser.py

@@ -1,29 +0,0 @@
-import argparse
-
-# reference: https://gist.github.com/sampsyo/471779#gistcomment-2886157
-
-
-class AliasedSubParsersAction(argparse._SubParsersAction):
-    class _AliasedPseudoAction(argparse.Action):
-        def __init__(self, name, aliases, help):
-            dest = name
-            if aliases:
-                dest += ' (%s)' % ','.join(aliases)
-            sup = super(AliasedSubParsersAction._AliasedPseudoAction, self)
-            sup.__init__(option_strings=[], dest=dest, help=help)
-
-    def add_parser(self, name, **kwargs):
-        aliases = kwargs.pop('aliases', [])
-        parser = super(AliasedSubParsersAction, self).add_parser(name, **kwargs)
-
-        # Make the aliases work.
-        for alias in aliases:
-            self._name_parser_map[alias] = parser
-        # Make the help text reflect them, first removing old help entry.
-        if 'help' in kwargs:
-            help = kwargs.pop('help')
-            self._choices_actions.pop()
-            pseudo_action = self._AliasedPseudoAction(name, aliases, help)
-            self._choices_actions.append(pseudo_action)
-
-        return parser