[Maintenance] Improve handling of arguments and environment variables

[afwolfe]

This PR supports #112 by:

• Removing the separate variable per configuration option and replacing it with a list of arguments and a dictionary of environment variables
• Sharing common lists of arguments between the different types of games.
  • (ex wrapperArgs for the wrapper commands goes first)
• Assembling the full list and dictionary into strings during createlaunchfile.
  • Arguments and paths no longer need to be suffixed with a space, as this happens automatically during the string " ".join() command in createlaunchfile.
• Returning the list and dictionary also made it easier to create unit tests by looking at the returned lists and dictionary items.
• Removes two options that have been deprecated in HeroicGamesLauncher (audioFix and enableResizableBar)

Future arguments and environment variables implemented in the HeroicBashLauncher should now only need to:

1. Check the appropriate configuration elements and
2. add the argument(s) or environment variable(s) to the appropriate list or dictionary.

[redromnon]

Tested. LTGM :+1: