D29057: Introduce PlaceholderMessage component

[Nathaniel Graham]

ngraham created this revision.
ngraham added reviewers: VDG, Kirigami, mart.
Herald added a project: Kirigami.
Herald added a subscriber: plasma-devel.
ngraham requested review of this revision.

REVISION SUMMARY
  This patch creates the `PlaceholderMessage`, a re-usable component that can be used
  to create all kinds of placeholder messages with a standardized appearance. It can be a
  loading screen, an "there's no content in this view" message, an error message, and more.

TEST PLAN
  In Discover, with DDDDDD: F8251669: In Discover.png <https://phabricator.kde.org/F8251669>
  In Plasma-Thunderbolt, with DDDDD:  F8251670: In System Settings.png <https://phabricator.kde.org/F8251670>
  
  More will be ported if and when this patch lands.

REPOSITORY
  R169 Kirigami

BRANCH
  placeholder-message (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D29057

AFFECTED FILES
  Mainpage.dox
  kirigami.qrc
  kirigami.qrc.in
  src/controls/PlaceholderMessage.qml
  src/controls/plugins.qmltypes
  src/kirigamiplugin.cpp
  src/qmldir

To: ngraham, #vdg, #kirigami, mart
Cc: cblack, plasma-devel, fbampaloukas, GB_2, domson, dkardarakos, ngraham, apol, ahiemstra, davidedmundson, mart
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