#378 Alter touched and error if FA.remove and FA.pop

[jaredpalmer]

This solves #378 .

tl;dr
When either pop() or remove() is called, the related partial object within errors and touched are also removed. I also added proper generics (which somehow no one noticed) 🤷‍♀️

[a-tarasyuk]

@jaredpalmer Does it mean that when we remove/push item, setState will be called 3 times(also render fires 3 times)? Maybe would be better to have one method which will update 3 fields and call setState only once? What do you think? Does it make sense?