A new debugger.

Lots of bugs/rough edges/etc - issues will be filed.
Old-style debugging still works (just use --emit_source_annotations to get
the helpful movs back and --break_on_instruction will still fire).

src/xenia/emulator.h

@@ -76,7 +76,8 @@ class Emulator {
   X_STATUS LaunchStfsContainer(std::wstring path);
 
  private:
-  bool ExceptionCallback(ExceptionHandler::Info* info);
+  static bool ExceptionCallbackThunk(Exception* ex, void* data);
+  bool ExceptionCallback(Exception* ex);
 
   X_STATUS CompleteLaunch(const std::wstring& path,
                           const std::string& module_path);