Refactor UI config logic into a core module

Moves the logic for saving and loading configuration files from the main UI script into the `FFUUI.Core.Config` module. This change improves modularity and separation of concerns, making the code easier to maintain.

The main `BuildFFUVM_UI.ps1` script is simplified, with event handlers now calling the new, dedicated functions in the core module to manage configuration state.

Also corrects the path for the `FFUConfig.json` file.

FFUDevelopment/FFUUI.Core/FFUUI.Core.Handlers.psm1

@@ -723,5 +723,18 @@ function Register-EventHandlers {
             $localState = $window.Tag
             Import-DriversJson -State $localState
         })
+
+    $State.Controls.btnLoadConfig.Add_Click({
+            param($eventSource, $routedEventArgs)
+            $window = [System.Windows.Window]::GetWindow($eventSource)
+            $localState = $window.Tag
+            Invoke-LoadConfiguration -State $localState
+        })
+    $State.Controls.btnBuildConfig.Add_Click({
+            param($eventSource, $routedEventArgs)
+            $window = [System.Windows.Window]::GetWindow($eventSource)
+            $localState = $window.Tag
+            Invoke-SaveConfiguration -State $localState
+        })
 }
 Export-ModuleMember -Function *