Add 'Breeze Twilight' Global Theme

Breeze Twilight is a variant of Breeze Default that opts for the dark
variant of the Plasma Style instead.

With Kubuntu having taken this approach, and with Fedora now considering
this approach as well, it's time we consider doing it upstream, because
honestly Breeze Light for Applications + Breeze Dark for Desktop is a
really nice looking combination.

CMakeLists.txt

@@ -40,6 +40,7 @@ endif()
 
 find_package(KF5Package ${KF5_MIN_VERSION} CONFIG REQUIRED)
 kpackage_install_package(lookandfeel.dark org.kde.breezedark.desktop look-and-feel plasma)
+kpackage_install_package(lookandfeel.twilight org.kde.breezetwilight.desktop look-and-feel plasma)
 if(EXISTS ${CMAKE_SOURCE_DIR}/po AND IS_DIRECTORY ${CMAKE_SOURCE_DIR}/po)
     find_package(KF5I18n CONFIG REQUIRED)
     ki18n_install(po)

lookandfeel.twilight/contents/defaults

@@ -0,0 +1,23 @@
+[kdeglobals][KDE]
+widgetStyle=Breeze
+
+[kdeglobals][General]
+ColorScheme=BreezeLight
+
+[kdeglobals][Icons]
+Theme=breeze
+
+[plasmarc][Theme]
+name=breeze-dark
+
+[kcminputrc][Mouse]
+cursorTheme=breeze_cursors
+
+[kwinrc][WindowSwitcher]
+LayoutName=org.kde.breeze.desktop
+
+[kwinrc][DesktopSwitcher]
+LayoutName=org.kde.breeze.desktop
+
+[kwinrc][org.kde.kdecoration2]
+library=org.kde.breeze

lookandfeel.twilight/metadata.desktop

@@ -0,0 +1,16 @@
+[Desktop Entry]
+Comment=Breeze Twilight by the KDE VDG
+Name=Breeze Twilight
+Type=Service
+
+X-KDE-ServiceTypes=Plasma/LookAndFeel
+X-KDE-ParentApp=
+X-KDE-PluginInfo-Author=KDE Visual Design Group
+X-KDE-PluginInfo-Category=
+X-KDE-PluginInfo-Email=plasma-devel@kde.org
+X-KDE-PluginInfo-License=GPL-2.0+
+X-KDE-PluginInfo-Name=org.kde.breezetwilight.desktop
+X-KDE-PluginInfo-Version=2.0
+X-KDE-PluginInfo-Website=https://www.kde.org
+X-Plasma-MainScript=defaults
+X-KDE-PluginInfo-License=GPLv2+