Join-String dependency fix + Get-Path cleanup

If Join-String is missing, the 'string' module, if not existing will be
installed and then imported.
Get-Path produced an error when used with wildcard, fixed it with string
substituation.
Get-Path would output wildcard string when expansion didn't match, now
output will be blank.

base/Get-Path.ps1

@@ -27,17 +27,19 @@ process {
             }
         }
 
+        $p = $p -replace '#C-','#C-#' -replace '\*','#C-A#' -replace '\?','#C-Q#'
         if([System.IO.Path]::IsPathRooted($p)){
             $p = [System.IO.Path]::GetFullPath($p)
         }else{
             $p = [System.IO.Path]::GetFullPath((Join-Path $PWD $p))
         }
+        $p = $p -replace '#C-A#','*' -replace '#C-Q#','?' -replace '#C-#','#C-'
 
         if( $Expand ) {
             $p = $p | ForEach-Object {
                 if( Test-Path $p ) {
                     $p | Get-Item -Force | Select-Object -ExpandProperty FullName
-                } else {
+                } elseif( -not $Expand ) {
                     $p
                 }
             }