Add ksysDebugInput Singleton

src/KingSystem/ksysDebugInput.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <heap/seadDisposer.h>
+#include <prim/seadTypedBitFlag.h>
+
+namespace ksys {
+
+class DebugInput {
+    SEAD_SINGLETON_DISPOSER(DebugInput)
+
+public:
+    DebugInput() = default;
+    virtual ~DebugInput() = default;
+    void update();
+
+private:
+    sead::BitFlag8 mFlags;
+    float mLastDelta = 0;
+};
+
+}  // namespace ksys