File Explorer Changes

[anthonyfabius]

Description

Closes #(310)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (improvement to an already existing feature)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

• Multiple game files have been opened with the new explorer.
• Opening a different file while in a game.
• The alteration of user preferences to see if they are reflected on the explorer

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[anthonyfabius]

I committed some more code that reopens the file explorer if the first file selected is faulty. The JPanel Error message still shows up but now when you click "Ok" to close it a new file explorer opens so that the user can open up a new (hopefully valid) file.

[Chase-Grajeda]

Passes test cases, ready for merge