Add WSH as an alias for WScript in scripthost.d.ts

Author: paulkoerbitz

src/lib/scripthost.d.ts

@@ -201,6 +201,11 @@ declare var WScript: {
     Sleep(intTime: number): void;
 };
 
+/**
+ * WSH is an alias for WScript under Windows Script Host
+ */
+declare var WSH: typeof WScript;
+
 /**
  * Represents an Automation SAFEARRAY
  */