Land rapid7#7102, remove struct2 code in favor of rex-struct2

Author: dmohanty-r7

Gemfile.lock

@@ -34,6 +34,7 @@ PATH
       rex-powershell
       rex-random_identifier
       rex-registry
+      rex-struct2
       rex-text
       rex-zip
       robots
@@ -224,6 +225,7 @@ GEM
     rex-random_identifier (0.1.0)
       rex-text
     rex-registry (0.1.0)
+    rex-struct2 (0.1.0)
     rex-text (0.1.1)
     rex-zip (0.1.0)
       rex-text

lib/rex.rb

@@ -53,6 +53,8 @@ module Rex
 require 'rex/registry'
 # Library for parsing Java serialized streams
 require 'rex/java'
+# Library for creating C-style Structs
+require 'rex/struct2'
 
 # Generic classes
 require 'rex/constants'