(#43) Implemented focus handling for cut/copy/paste
(#43) half-decent cut/copy/paste
(#43) fixed bugs in focus handling, improved performance of dragging selection
(#43) copy/paste cleanup
Merge branch 'feature/43-cut-copy-paste'

* feature/43-cut-copy-paste:
  (#43) copy/paste cleanup
  (#43) fixed bugs in focus handling, improved performance of dragging selection
  (#43) half-decent cut/copy/paste
  (#43) Implemented focus handling for cut/copy/paste