NVAR parsing support

- still no proper menus for data extraction
- other NVRAM formats TBD

common/types.h

@@ -42,7 +42,8 @@ namespace Types {
         Volume,
         File,
         Section,
-        FreeSpace
+        FreeSpace,
+        NvramVariableNvar
     };
 }
 
@@ -83,6 +84,13 @@ namespace Subtypes {
         OnePadding,
         DataPadding
     };
+
+    enum NvarVariableSubtypes {
+        InvalidNvar = 120,
+        LinkNvar,
+        DataNvar,
+        FullNvar
+    };
 };
 
 // *ToQString conversion routines