Fix up handling of positional options in cvar handling.

- Fix up handling of positional options in cvar handling so that executables
  other than app can handle them properly.
- Fix command-line arguments for xenia-vfs-dump.

src/xenia/base/main.h

@@ -2,7 +2,7 @@
  ******************************************************************************
  * Xenia : Xbox 360 Emulator Research Project                                 *
  ******************************************************************************
- * Copyright 2014 Ben Vanik. All rights reserved.                             *
+ * Copyright 2019 Ben Vanik. All rights reserved.                             *
  * Released under the BSD license - see LICENSE in the root for more details. *
  ******************************************************************************
  */
@@ -13,6 +13,7 @@
 #include <string>
 #include <vector>
 
+#include "xenia/base/cvar.h"
 #include "xenia/base/platform.h"
 
 namespace xe {
@@ -24,14 +25,19 @@ bool has_console_attached();
 // launch.
 struct EntryInfo {
   std::wstring name;
-  std::wstring usage;
+  std::string positional_usage;
+  std::vector<std::string> positional_options;
   int (*entry_point)(const std::vector<std::wstring>& args);
 };
 EntryInfo GetEntryInfo();
 
-#define DEFINE_ENTRY_POINT(name, usage, entry_point)  \
-  xe::EntryInfo xe::GetEntryInfo() {                  \
-    return xe::EntryInfo({name, usage, entry_point}); \
+#define DEFINE_ENTRY_POINT(name, entry_point, positional_usage, ...)       \
+  xe::EntryInfo xe::GetEntryInfo() {                                       \
+    std::initializer_list<std::string> positional_options = {__VA_ARGS__}; \
+    return xe::EntryInfo(                                                  \
+        {name, positional_usage,                                           \
+         std::vector<std::string>(std::move(positional_options)),          \
+         entry_point});                                                    \
   }
 
 }  // namespace xe