Move CleanVSIX out of the main build process
Move CleanVSIX out of the main build process

bentayloruk/FSharpVSPowerTools,enricosada/VisualFSharpPowerTools,dedale/VisualFSharpPowerTools,dungpa/PowerTools,cloudRoutine/VisualFSharpPowerTools,smoothdeveloper/VisualFSharpPowerTools,xperiandri/VisualFSharpPowerTools,0x53A/VisualFSharpPowerTools,ovatsus/VisualFSharpPowerTools,enricosada/VisualFSharpPowerTools,isaacabraham/VisualFSharpPowerTools,forki/FSharpVSPowerTools,cloudRoutine/VisualFSharpPowerTools,yever/VisualFSharpPowerTools,dkinitiate/VisualFSharpPowerTools,fsprojects/VisualFSharpPowerTools,bleis-tift/FSharpVSPowerTools,vasily-kirichenko/FSharpVSPowerTools,vasily-kirichenko/FSharpVSPowerTools,bleis-tift/FSharpVSPowerTools,fsprojects/VisualFSharpPowerTools