Use ps1 for killing process

Makefile

@@ -58,7 +58,7 @@ ifeq ($(OS),Windows_NT)
   CBUILD := cmd /C $(CBUILD)
   CTEST := cmd /C $(CTEST)
   # finally add stop command
-  STOP_SERVER := taskkill.exe /F /IM skyd.exe
+  STOP_SERVER := Powershell.exe -executionpolicy remotesigned -File ci\windows\stop.ps1
 else
   # not windows, so archive is easy
   ARCHIVE += zip -j ourbundle.zip $(BINARY_SKYSH) $(BINARY_SKYD) $(BINARY_SKYBENCH) $(BINARY_SKYMIGRATE)

ci/windows/stop.ps1

@@ -0,0 +1,3 @@
+$ProcessID=(get-process skyd).id
+$encodedCommand = [Convert]::ToBase64String([System.Text.Encoding]::Unicode.GetBytes("Add-Type -Names 'w' -Name 'k' -M '[DllImport(""kernel32.dll"")]public static extern bool FreeConsole();[DllImport(""kernel32.dll"")]public static extern bool AttachConsole(uint p);[DllImport(""kernel32.dll"")]public static extern bool SetConsoleCtrlHandler(uint h, bool a);[DllImport(""kernel32.dll"")]public static extern bool GenerateConsoleCtrlEvent(uint e, uint p);public static void SendCtrlC(uint p){FreeConsole();AttachConsole(p);GenerateConsoleCtrlEvent(0, 0);}';[w.k]::SendCtrlC($ProcessID)"))
+start-process powershell.exe -argument "-nologo -noprofile -executionpolicy bypass -EncodedCommand $encodedCommand"