Fix parent avatar

[gnunicorn]

As reported in acterglobal/a3#1184 : When the main avatar is going to fallback, we didn't show the parent avatar properly.

1. Added an Example showing the problem (notice the parent of the third from the left)
   
2. Simplify code to just reuse the inner avatar for the parent
3. Show it works:
   
4. Add changelog entry
5. Fix tests
6. Add refreshing of avatar data upon Widget changes (to react to provider updates of avatar data)

[gnunicorn]

@gtalha07 if you have any idea how to nicely test for 6, that'd be great!

[gtalha07]

@gtalha07 if you have any idea how to nicely test for 6, that'd be great!

Don't have idea rn how to validate refresh changes with tests but would come up with something later. We can proceed to merge it! ;)

[gtalha07]

Loooks good....Thanks!