Bitfield: Add BSD license to match BitField.h

Also, fix typo.

Source/Core/Common/BitField.natvis

@@ -1,5 +1,38 @@
-<?xml version="1.0" encoding="utf-8"?> 
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright 2015 Scott Mansell
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+      * Redistributions of source code must retain the above copyright
+        notice, this list of conditions and the following disclaimer.
+      * Redistributions in binary form must reproduce the above copyright
+        notice, this list of conditions and the following disclaimer in the
+        documentation and/or other materials provided with the distribution.
+      * Neither the name of the owner nor the names of its contributors may
+        be used to endorse or promote products derived from this software
+        without specific prior written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+-->
+
 <AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+  <!--
+    This is a re-implementation of the abstract bitfield class' algrothm (in BitField.h)
+    for visual studio to use for pretty-printing during debugging.
+  -->
   <Type Name="BitField&lt;*,*,*&gt;">
     <DisplayString Condition="$T2 == 1"><![CDATA[{(storage & (1 << $T1)) != 0}]]></DisplayString>
     <DisplayString><![CDATA[{(storage >> $T1) & ((1 << $T2) - 1)}]]></DisplayString>
@@ -14,7 +47,7 @@
   <Type Name="BitField&lt;*,*,__int64&gt;">
     <!-- This is what I have do to get a sign extension in this crappy natvis "language"
          Basically, we check the top bit, if it's one, we add the remaining
-         bits to the smallest (most negitive) number. -->
+         bits to the smallest (most negative) number. -->
     <DisplayString Condition="(storage &amp; (1 &lt;&lt; ($T1 + $T2))) != 0">
       <![CDATA[{(-1 * (1 << ($T2-1))) + ((storage >> $T1) & ((1 << ($T2-1)) - 1))}]]>
     </DisplayString>