Preview changes in component properties window without saving them

The interaction in the component properties window will become as follows:

1. On a property change, the background component reloads directly and renders with the changed values. A property 'changes' when its editing field is blurred, a new value is selected (e.g. in dropdowns and pickers), 'checked' (in a checkbox), or a user hits 'enter' in a textfield.

2. The 'Cancel' button will change to 'Close' and trigger a reload of the background component (because the background component may have been rendered with preview properties of a different variant)

3. The 'Save' button will, as it already does in the 7.9, only save the changes of the variant that's currently visible (i.e. the current tab in the relevance module). It does not save preview changes from other variants.

4. When switching back to a variant that contains preview changes, the background component will show those preview changes again.

5. The variants that contain preview changes will be marked with a * (asterisk) to indicate they are 'dirty'. After clicking 'Save' the dirty indicator of the saved variant is removed. Other dirty variants will still show the dirty indicator.