D16879: [Login and Lock screens] Improve UI elements' contrast a bit

[Nathaniel Graham]

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

REVISION SUMMARY
  As requested in D16031 <https://phabricator.kde.org/D16031>, tweak the login and lock screens in only fairly non-controversial ways:
  
  - Add a dark background behind the user avatar
  - Add shadows behind the username and the buttons
  - Tweak the clock shadow to make it a tiny bit stronger
  - Reduce clock shadow redundancy by moving it into the `Clock` item and out of the users and not using hardcoded colors anymore
  
  This diff does NOT include the following changes from D16031 <https://phabricator.kde.org/D16031>:
  
  - Blur-less login screen
  - New icons for the buttons
  - Horizontal bar on the bottom to hold the buttons for the virtual keyboard, session chooser, and bettery status

TEST PLAN
  [images go here]

REPOSITORY
  R120 Plasma Workspace

BRANCH
  lock-and-login-screen-contrast-tweaks (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D16879

AFFECTED FILES
  lookandfeel/contents/components/ActionButton.qml
  lookandfeel/contents/components/Clock.qml
  lookandfeel/contents/components/UserDelegate.qml
  lookandfeel/contents/lockscreen/LockScreenUi.qml
  sddm-theme/Main.qml

To: ngraham, davidedmundson, #vdg, #plasma
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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