Allow hiding buttons in settings

[LordIdra]

Needed to remove texture buttons if the server has texture packs disabled.

Right now you can use if/else statements but it'll leave gaps in the settings.

To fix this we probably just want to make the settings GUI a paged GUI. But we might want to change this in future.

[LordIdra]

resource pack settings will have their own page soon but we;ll want this regardless