Allowed page changing from outside & Fixed all the typos

[moazelsawaf]

Hello Dear,

In the Pull Request you will find 2 commits, one of them to allow the page changing from outside, and the second is just a fix for all the typos.

For the page changing, it was always handled automatically by the package from inside the class, my commit is adding a property called manuallyHandelPageChange to leave the control of page changing for the provided onItemSelected callback.

I hope you find this helpful.

Good Luck ❤

[moazelsawaf]

@BilalShahid13 Any Updates?