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
                 }
             }

base/profile.d/Join-String.ps1

@@ -0,0 +1,12 @@
+if( -not (Get-Command Join-String -ErrorAction SilentlyContinue) ) {
+  if( -not (Get-Module -ListAvailable -Name "string") ) {
+    Write-Warning 'Join-String Command is missing, attempting to install stirng module'
+    $local:moduleScope = "CurrentUser"
+    if( Test-IsAdmin ) { $moduleScope = "AllUsers" }
+    Install-Module -Name "string" -Scope $moduleScope -AllowClobber -ErrorAction SilentlyContinue
+  }
+  if( -not (Get-Module -ListAvailable -Name "string") ) {
+    Write-Error "Failed to locate/install the module 'string'"
+  }
+  Import-Module -Name "string" -Cmdlet "Join-String"
+}