* Was able to generate a kded service file
* Was able to generate a kded service file with `SystemdUnit`
* Verified that it moaned when executable wasn't an absolute path
* Untested on Windwos
Usage:
```
ecm_generate_dbus_service_file(NAME org.kde.kded5
EXECUTABLE ${KDE_INSTALL_FULL_BINDIR}/kded5
SYSTEMD_SERVICE plasma-kded)
```