Added .inc files for common .ini files

Description

Adds empty .inc file references into important files in data/ini so that modders can more easily build on top of 2.02 without having to edit our files. Specifically requested by Mjjstral on Discord.

 

Checklist

I have:

• Tagged my change with the ;,; comment block.
• Ensured that this merge request changes exactly one thing.
• Attached the proper labels to this merge request.
• Added the Merge Request number in the title. e.g. (!42)
• Tested my code.