Massive dump of xenia-info required code.

This is a working xenia-info for xex files (no gdfs files yet).

src/core/sources.gypi

@@ -1,6 +1,21 @@
 # Copyright 2013 Ben Vanik. All Rights Reserved.
 {
   'sources': [
-    'something.cc',
+    'file.cc',
+    'memory.cc',
+    'pal.cc',
+    'ref.cc',
+  ],
+
+  'conditions': [
+    ['OS == "mac" or OS == "linux"', {
+      'sources': [
+        'mmap_posix.cc',
+      ],
+    }],
+    ['OS == "win"', {
+      'sources': [
+      ],
+    }],
   ],
 }