Added uninstaller check for running game

packaging/windows/OpenRA.nsi

@@ -18,6 +18,7 @@
 !include "MUI2.nsh"
 !include "FileFunc.nsh"
 !include "WordFunc.nsh"
+!include "nsProcess.nsh"
 
 Name "OpenRA"
 OutFile "OpenRA.Setup.exe"
@@ -211,6 +212,7 @@ Function ${UN}Clean
 	Delete $INSTDIR\eluant.dll
 	Delete $INSTDIR\freetype6.dll
 	Delete $INSTDIR\zlib1.dll
+	Delete $INSTDIR\SDL2-CS.dll
 	RMDir /r $INSTDIR\Support
 	DeleteRegKey HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\OpenRA"
 	Delete $INSTDIR\uninstaller.exe
@@ -227,7 +229,19 @@ FunctionEnd
 !insertmacro Clean "un."
 
 Section "Uninstall"
+	${nsProcess::FindProcess} "OpenRa.Game.exe" $R0
+	IntCmp $R0 0 gameRunning
+	${nsProcess::FindProcess} "OpenRa.exe" $R0
+	IntCmp $R0 0 gameRunning
+	${nsProcess::FindProcess} "OpenRa.Editor.exe" $R0
+	IntCmp $R0 0 gameRunning
+	${nsProcess::Unload}
 	Call un.Clean
+	Goto end
+	gameRunning:
+		MessageBox MB_OK|MB_ICONEXCLAMATION "OpenRa is running. Please close it first" /SD IDOK
+		abort
+	end:
 SectionEnd
 
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