feat: add core feature support

[FlayaN]

• Created a virtual method that can be overridden for it to instead show up under Core Features group in menu
• Zip folder with the file CORE them in the core CS zip file instead of their own zip file (also set for FG in this case)
• Move feature Disable at Boot and Restore Defaults button to one line
• Marked Dynamic Cubemaps and Extended Materials as core features

before:

after:

[Pentalimbed]

Personally, I'd make IsCore a virtual function like GetName, and separate zip specification from cpp code, because:

1. It preserves the custom.
2. Whether a feature is core or not should be hardcoded, not dependant on an external file.
3. (Following 2) In case the ini file is missing, the core feature then becomes non-core and disappears in the menu, which is not what we want.

If separated, you can say just check if there is an empty CORE file in the directory and pack them in the main zip.

[doodlum]

Personally, I'd make IsCore a virtual function like GetName, and separate zip specification from cpp code, because:

1. It preserves the custom.
2. Whether a feature is core or not should be hardcoded, not dependant on an external file.
3. (Following 2) In case the ini file is missing, the core feature then becomes non-core and disappears in the menu, which is not what we want.

If separated, you can say just check if there is an empty CORE file in the directory and pack them in the main zip.

Was actually profjacks input