ForwardRef for H3

[Vangaorth]

Short description

This PR proposes a way to pass a view reference from a top screen to an inner component, using MainScreen and H3 as an example.

List of changes proposed in this pull request

• H3 uses React.forwardRef to receive the ref as an input and it gives it to Factory as the second optional function parameter;
• Factory has a generic type that cannot be used in combination with React.forwardRef, that's why ref is received as a second optional function parameter. It is later passed down to BaseTypography as a standard React view's property;
• BaseTypography uses React.forwardRef to receive ref and to set it to its inner Text component.

The downside of this approach is that, when used in the main screen, the hook must not be explicitly typed, otherwise typescript complains about it, when passed to the H3 element. E.g.:

const aRef = useRef(null); // This works
const aRef = useRef<View|null>(null); // This does not

How to test

Using the example app, check that the ref.current is properly initialized.

[Vangaorth]

Replaced by #264