Change Log for PSScriptTools

v2.8.0

• Added Get-FileItem with an alias of pswhere
• Renamed timezonedata.format.ps1xml to all lower case.
• Replaced using Out-Null to use [void] in Convertto-WPFGrid,
  New-PSFormatXML, Copy-Command,New-WPFMessageBox, Write-Detail,
  Test-Expression,Invoke-Inputbox (Issue #47)
• Revised warning message in New-PSFormatXML (Issue #50)
• Fixed icon path error in New-WPFMessageBox