Move contact selector to fragment

[hegocre]

Fixes part of #318

As a side note, save_menu.xml could also be used for moving save button to appbar on reply editor activity.

[adeekshith]

Very nice 😃! Thank you @hegocre

• Can we auto save selected contacts without clicking on the save button (may be we need a listener)?

save_menu.xml could also be used for moving save button to appbar on reply editor activity

😊👍

and yayy more Kotlin!!

[hegocre]

Can we auto save selected contacts without clicking on the save button (may be we need a listener)?

The idea of having to save it manually was to be able to change contacts with the ability to undoing by just going back.
What we can do is every time the users tries to go back and exit the activity, a dialog appears asking whether the user wants to save or discard changes.

[adeekshith]

What we can do is every time the users tries to go back and exit the activity, a dialog appears asking whether the user wants to save or discard changes.

Dialog idea sounds good! May be we can merge this now and do the dialog change in another iteration.

Also made a layout change in #327

[hegocre]

Dialog idea sounds good! May be we can merge this now and do the dialog change in another iteration.

Nice! Maybe add it as a task on #318 so we don't forget