add function to manage taskbar item

changed from manually setting the taskbar overlay, progressvalue and progress state to setting them through a function

functions/public/Invoke-WPFMicrowin.ps1

@@ -4,7 +4,6 @@ function Invoke-WPFMicrowin {
         Invoke MicroWin routines...
     #>
 
-	$sync["Form"].taskbarItemInfo.ProgressState = "Indeterminate"
 
 	if($sync.ProcessRunning) {
         $msg = "GetIso process is currently running."
@@ -44,6 +43,8 @@ public class PowerManagement {
         return
     }
 
+	Set-WinUtilTaskbaritem -state "Indeterminate"
+
     Write-Host "Target ISO location: $($SaveDialog.FileName)"
 
 	$index = $sync.MicrowinWindowsFlavors.SelectedValue.Split(":")[0].Trim()
@@ -479,6 +480,6 @@ public class PowerManagement {
 		# Allow the machine to sleep again (optional)
 		[PowerManagement]::SetThreadExecutionState(0)
 		$sync.ProcessRunning = $false
-		$sync["Form"].taskbarItemInfo.ProgressState = "None"
+		Set-WinUtilTaskbaritem -state "None"
 	}
 }