Add an easy way to exclude cookie categories completely

[alimony]

If I don't use e.g. performance or marketing cookies on my website, I want to hide those sections completely in the cookie settings dialogue. There does not seem to be an easy way to do this at the moment.

[Deepcuts]

	performance: false, //Cookies in the performance category.
	analytics: false, //Cookies in the analytics category.
	marketing: false //Cookies in the marketing category.