Add todo action: "mark as done"

We can implement this behavior in two ways:

  1. Add button Done/Undo into item_target list item. But we have to add some abstractions to TargetHeader entity.
  2. Add LongItemClickListener with displaying alert dialog
Title -> Make done todo
Buttons -> Cancel Done
Title -> Make undo todo
Buttons -> Cancel Undo
Edited by Eugene Shapovalov
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