Added vscode support

VSCode renders themes pretty nicely with the following setting to change terminal fonts to use a Powerline font:

```
"terminal.integrated.fontFamily": "'DejaVu Sans Mono for Powerline'"
```

Author: Tiberriver256

Helpers/Prompt.ps1

@@ -7,6 +7,10 @@ function Test-IsVanillaWindow {
         # Hyper.is
         return $false
     }
+    elseif ($env:TERM_PROGRAM -eq "vscode") {
+        # Visual Studio Code 
+        return $false
+    }
     else {
         # Powershell
         return $true
@@ -171,4 +175,4 @@ function Set-CursorUp {
 }
 
 $escapeChar = [char]27
-$sl = $global:ThemeSettings #local settings
+$sl = $global:ThemeSettings #local settings