classname in the cache key

[oduvan]

The name for content settings should include the name of the class.

So if the class is updated, that means the key for the cache should be changed, but the value will not be reset because the version remains the same.

Need to think what we will do with mixins. We need a mechanism to understand that what was the classes in the mixin. That mechanism can be used in the future for the help in life