Add aocManager header stub

src/Game/DLC/CMakeLists.txt

@@ -1,4 +1,6 @@
 target_sources(uking PRIVATE
   aoc2.cpp
   aoc2.h
+  aocManager.cpp
+  aocManager.h
 )

src/Game/DLC/aocManager.cpp

@@ -0,0 +1 @@
+#include "Game/DLC/aocManager.h"

src/Game/DLC/aocManager.h

@@ -0,0 +1,39 @@
+#pragma once
+
+#include <heap/seadDisposer.h>
+#include <prim/seadSafeString.h>
+#include "KingSystem/Resource/resHandle.h"
+#include "KingSystem/Resource/resResourceMgrTask.h"
+
+namespace sead {
+class FileDevice;
+}
+
+namespace uking::aoc {
+
+// TODO
+class Manager {
+    SEAD_SINGLETON_DISPOSER(Manager)
+    Manager();
+    ~Manager();
+
+public:
+    u32 getVersion() const { return mVersion; }
+
+    /// @return Whether the Master Trials DLC is supported.
+    bool hasAoc2() const { return mVersion >= 0x200; }
+
+    /// @return Whether the Champion's Ballad DLC is supported.
+    bool hasAoc3() const { return mVersion >= 0x300; }
+
+private:
+    sead::FileDevice* mFileDevice{};
+    ksys::res::FileDevicePrefix mFileDevicePrefix;
+
+    ksys::res::Handle mVersionResHandle;
+    sead::FixedSafeString<16> mVersionString;
+    u32 mVersion{};
+    // TODO: more fields
+};
+
+}  // namespace uking::aoc