Add basic kde support

ScreenPlayWallpaper/kde/ScreenPlay/README.md

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+# ScreenPlay Wallpaper for KDE Plasma Desktop
+
+One has to install it via the command below. Simply putting it into:
+* ~/.local/share/plasma/wallpapers/
+Will not work because KDE uses the kpluginindex.json (that is actually a bz2 file. Do not ask why...) to load all available wallpaper. 
+
+#### Installation
+```
+plasmapkg2 --install ScreenPlay
+```
+
+#### Application structure
+Because Wallpaper and Widgets are already a different application we can extend the logic for KDE. For this we create a local websocket instance to communicate with our main ScreenPlay app.

ScreenPlayWallpaper/kde/ScreenPlay/contents/config/main.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<kcfg xmlns="http://www.kde.org/standards/kcfg/1.0"
+      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+      xsi:schemaLocation="http://www.kde.org/standards/kcfg/1.0
+      http://www.kde.org/standards/kcfg/1.0/kcfg.xsd" >
+  <kcfgfile name=""/>
+
+  <group name="General">
+      <entry name="StopWallpaperIfHidden" type="Bool">
+      <label>Stop Wallpaper if not visible</label>
+      <default>false</default>
+    </entry>
+  </group>
+
+</kcfg>

ScreenPlayWallpaper/kde/ScreenPlay/contents/ui/config.qml

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+import QtQuick 2.11
+import QtQuick.Controls 2.4 as QQC
+import QtQuick.Window 2.0 
+import QtGraphicalEffects 1.0
+
+import org.kde.plasma.core 2.0 as PlasmaCore
+import org.kde.plasma.wallpapers.image 2.0 as Wallpaper
+import org.kde.kcm 1.1 as KCM
+import org.kde.kirigami 2.4 as Kirigami
+import org.kde.newstuff 1.1 as NewStuff
+
+
+
+ Column {
+	 id: root
+	 anchors.fill:parent
+
+	 property alias  cfg_StopWallpaperIfHidden: stopWallpaperIfHidden.checked
+	 spacing: units.largeSpacing
+
+	 Row {
+		 anchors.horizontalCenter: parent.horizontalCenter
+		 spacing: units.largeSpacing
+		       QQC.CheckBox {
+				 id: stopWallpaperIfHidden
+				 text:  i18nd("plasma_applet_org.kde.image","Stop animation when a window is maximized");
+			 }
+	 }
+
+
+ }
+

ScreenPlayWallpaper/kde/ScreenPlay/contents/ui/main.qml

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+import QtQuick 2.11
+import org.kde.plasma.core 2.0 as PlasmaCore
+import QtGraphicalEffects 1.0
+import QtQuick.Window 2.0
+
+Rectangle {
+    id: root
+    color: "orange"
+    width: Screen.width
+    height: Screen.height
+
+}

ScreenPlayWallpaper/kde/ScreenPlay/metadata.desktop

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+[Desktop Entry]
+Encoding=UTF-8
+Name=ScreenPlay
+Keywords=ScreenPlay
+Icon=preferences-desktop-wallpaper
+
+Type=Service
+
+X-KDE-ServiceTypes=Plasma/Wallpaper
+X-KDE-ParentApp=
+X-KDE-PluginInfo-Name=ScreenPlay
+X-KDE-PluginInfo-EnabledByDefault=true
+X-KDE-PluginInfo-Version=3
+X-KDE-PluginInfo-Website=https://gitlab.com/kelteseth/screenplay
+
+X-Plasma-MainScript=ui/main.qml
+
+MimeType=image/gif;image/png;image/svg+xml;image/svg+xml-compressed;video/x-mng;
+X-Plasma-DropMimeTypes=image/gif,image/png,image/svg+xml,image/svg+xml-compressed,video/x-mng