Code Syntax Refactoring Try #2

[NekoShinobi]

This is the same as PR#192, except it reverts almost all ==True ==False changes.

All changes should be purely aesthetic except for the following:

• not key in dict is changed to key not in dict. These are the same, but the latter is standard.
• x == None is changed to x is None and x != None is changed to x is None. Unless the object x overrides its __eq__ method to handle it, it should behave exactly the same. Let me know if this is an okay change to make.
• Under mpv.py I changed _fileIsLoaded() to much simpler logic. Both logic is binary, so it should not affect any functionality.
• Under ConfigurationGetter.py I have changed if str(varToTest).isdigit() == False: to if not str(varToTest).isdigit() since this is a python built-in.

Additional Personal Notes:

• x == True ideally in the future should be changed. This syntax forces a check to strict True values such as True or 1, but it makes it so all "truthy" values are False. e.g. 2 == True is False,
• x == False ideally should be changed to not x and not None because this allows all 'Falsey' values to evaluate how they're expected to. e.g. if '' == False will evaluate as False but if not '' evaluates True. We add a and not None to handle the special None case.

[Et0h]

You rename bytes 'num_of_bytes' at the top of the def but not in the subsequent code. This results in all sizes being incorrectly reported as '???'.

[NekoShinobi]

Thanks for catching that. I forgot I had made this change. It's to avoid shadowing the bytes keyword.