replace MailboxProcessor blocking ProjectProvider cache with one based on ConcurrentDictionary
replace MailboxProcessor blocking ProjectProvider cache with one based on ConcurrentDictionary

fsprojects/VisualFSharpPowerTools,cloudRoutine/VisualFSharpPowerTools,dkinitiate/VisualFSharpPowerTools,dungpa/PowerTools,vasily-kirichenko/FSharpVSPowerTools,isaacabraham/VisualFSharpPowerTools,fsprojects/VisualFSharpPowerTools,cloudRoutine/VisualFSharpPowerTools,smoothdeveloper/VisualFSharpPowerTools,vasily-kirichenko/FSharpVSPowerTools,forki/FSharpVSPowerTools