Streamlined pwsz loading from Linux shells

Get-Path updated to support @ notation.
MyConfig class updated to resolve Paths before testing.
MyScript class will look recursivley - this might need to change again.
config.files.json updated to support shell-loading-snippets
shell-loading-snippets added, with single line of code to inject into
startup shell scripts (.zshrc, .bashrc, .shrc)

base/profile.d/MyScript.class.ps1

@@ -2,7 +2,7 @@ class MyScript { #: System.Management.Automation.IValidateSetValuesGenerator {
     static [string[]] _GetValidValues([string]$wordToComplete,[bool]$CurrentOnly,[bool]$Strict) {
         $local:possibleValues = $(
             Get-MyPackages -ReturnFullPath -IncludeRoot -Force:$(-not $CurrentOnly) |
-                Get-ChildItem -Filter '*.ps1' |
+                Get-ChildItem -Recurse -Filter '*.ps1' |
                 Select-Object -ExpandProperty FullName | ForEach-Object {
                     $_ -replace '\.ps1$','' -replace "$($MyPSScriptRoot -replace '\\',"\\")[/\\]",''
                 }