[Differential] [Updated] D2345: use a separate configuration per look and feel

[mart (Marco Martin)]

mart added a dependent revision: D2449: small utility to create L&F packages.

REPOSITORY
  rPLASMAWORKSPACE Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D2345

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To: mart, davidedmundson, #plasma
Cc: graesslin, davidedmundson, ivan, plasma-devel, lesliezhai, ali-mohamed, 
jensreuterberg, abetts, sebas