D5339: Include a bottom toolbar for the application page

[Aleix Pol Gonzalez]

apol added reviewers: colomar, jensreuterberg.

REPOSITORY
  R134 Discover Software Store

REVISION DETAIL
  https://phabricator.kde.org/D5339

To: apol, leinir, colomar, jensreuterberg
Cc: plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, 
sebas, apol