Add desktop files and autostart file for hwdevicetray

kcontrol/hwmanager/hwdevicetray-autostart.desktop

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+[Desktop Entry]
+Name=tdehwdevicetray
+GenericName=Hardware Device Monitor
+Comment=Monitor hardware devices from the system tray
+Exec=tdehwdevicetray
+Icon=kcmdevices
+X-TDE-autostart-after=panel
+X-TDE-StartupNotify=false
+X-TDE-UniqueApplet=true
+X-TDE-autostart-condition=tdehwdevicetrayrc:General:Autostart:true
+Categories=System;Applet;

kcontrol/hwmanager/hwdevicetray.desktop

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+[Desktop Entry]
+Name=tdehwdevicetray
+GenericName=Hardware Device Monitor
+Comment=Monitor hardware devices from the system tray
+Exec=tdehwdevicetray
+Icon=kcmdevices
+Type=Application
+OnlyShowIn=TDE;
+Categories=Qt;TDE;System;
+X-DocPath=tdehwdevicetray/index.html