native NetworkManager + all native dbus bindings via dms

- Scrap janky NetworkService in favor of, dms' native NM integration
  socket
- Scrap all gdbus usage in favor of native dbus bindings in dms
  (loginctl, freedesktop)

It means that - some features won't work if running without dms wrapper.

But the trade off is certainly worth it, in the long-run for efficiency
improvements.

Modals/NetworkInfoModal.qml

@@ -17,7 +17,7 @@ DankModal {
         networkData = data
         networkInfoModalVisible = true
         open()
-        NetworkService.fetchNetworkInfo(ssid)
+        NetworkManagerService.fetchNetworkInfo(ssid)
     }
 
     function hideDialog() {
@@ -101,7 +101,7 @@ DankModal {
                             id: detailsText
 
                             width: parent.width
-                            text: NetworkService.networkInfoDetails && NetworkService.networkInfoDetails.replace(/\\n/g, '\n') || "No information available"
+                            text: NetworkManagerService.networkInfoDetails && NetworkManagerService.networkInfoDetails.replace(/\\n/g, '\n') || "No information available"
                             font.pixelSize: Theme.fontSizeMedium
                             color: Theme.surfaceText
                             wrapMode: Text.WordWrap