D11012: Add Trash (empty, isEmpty, emptinessChanged)

[Roman Inflianskas]

rominf added a dependent revision: D11216: Update trash icon after restore operation.

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D11012

To: rominf, elvisangelaccio, markg, ngraham
Cc: ngraham, markg, rkflx, elvisangelaccio, #dolphin
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