Dependencies of playbar in CMakeList.txt#find_package

[tillschaefer]

There are some dependencies missing in CMakeList.txt and/or in README:md (that are currently only fulfilled in a transient way):

• qtgui (both)
• qtcore (readme)
• qtwidgets (readme)
• qtquickcontrols (readme)
• frameworks KConfig (both)
• frameworks KCoreAddons (both)
• frameworks KI18n (readme)
• frameworks KWidgetsAddons (both)

The dependency on the follwing packages is not necessary:

• plasma-workspace (readme)

Furthermore the qml dependencies are only runtime dependencies (all the QML stuff, qtdeclarative), its nice to add them in cmake with the help of kde/extra-cmake-modules via:
ECMQMLModules#ecm_find_qmlmodule
You can find an example here: https://phabricator.kde.org/D7273

However, they are only present in frameworks >=5.28. Thus, you would need to require a recent frameworks version.