Change Log for PSScriptTools

v2.21.0

Updated Set-ConsoleTitle and Set-ConsoleColor to display a warning if not in a console session. (Issue #75)
Added Get-GitSize and format file gitsize.format.ps1xml
Added a default ANSI color map file psansimap.json.
Modified module to use a copy of psansimap.json in $HOME if detected. Otherwise, use the module's version.
Create a global variable called PSAnsiFileMap from importing the psansimap.json file.
Updated Show-Tree to use an ansi color map. (Issue #69)
Added FileSystem-ansi.format.ps1xml which adds a custom view called ansi. This colorizes files based on $PSAnsiMap.
Updated Show-Tree to resolve child paths using -LiteralPath.
Updated README.md