<DA-327> refactor SearchResultTableSource for reusing cell
<DA-327> fix modifing collection inside iterator
<DA-327> fix (un)subcribtion for cells
<DA-327> refactor drallo cell
<DA-327> refactoring. Move shared code to base class
<DA-327> remove UIFinishedCell UIDownloadedCell
<unstable> Merge branch 'DA-327' into unstable