Initial commit: ROW Client source code

Game client codebase including:
- CharacterActionControl: Character and creature management
- GlobalScript: Network, items, skills, quests, utilities
- RYLClient: Main client application with GUI and event handlers
- Engine: 3D rendering engine (RYLGL)
- MemoryManager: Custom memory allocation
- Library: Third-party dependencies (DirectX, boost, etc.)
- Tools: Development utilities

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Library/dxx8/samples/Multimedia/DirectShow/DMO/GargleDMO/ControlBase/controlhelp.h

@@ -0,0 +1,71 @@
+//------------------------------------------------------------------------------
+// File: ControlHelp.h
+//
+// Desc: DirectShow sample code - definitions of CSliderValue and 
+//       CRadioChoice classes.
+//
+// Copyright (c) 2000-2001 Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------------------------
+
+
+#pragma once
+
+class Handler
+{
+public:
+    virtual LRESULT MessageHandler(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled) = 0;
+};
+
+class CSliderValue
+  : public Handler
+{
+public:
+    CSliderValue();
+    void Init(HWND hwndSlider, HWND hwndEdit, float fMin, float fMax, bool fDiscrete);
+
+    void SetValue(float fPos);
+    float GetValue();
+
+    LRESULT MessageHandler(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
+
+private:
+    bool                m_fInit;
+    HWND                m_hwndSlider;
+    HWND                m_hwndEdit;
+    float               m_fMin;
+    float               m_fMax;
+    bool                m_fDiscrete;
+
+private:
+    float GetSliderValue();
+    void UpdateEditBox(float fPos);
+    void UpdateSlider();
+};
+
+class CRadioChoice
+  : public Handler
+{
+public:
+    struct ButtonEntry
+    {
+        int nIDDlgItem;
+        LONG lValue;
+    };
+
+    // Create passing a ButtonEntry array terminated by an entry with nIDDlgItem of 0.
+    CRadioChoice(const ButtonEntry *pButtonInfo);
+
+    void SetChoice(HWND hDlg, LONG lValue);
+    LONG GetChoice(HWND hDlg);
+
+    LRESULT MessageHandler(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
+
+private:
+    const ButtonEntry *m_pButtonInfo;
+};
+
+// MessageHandlerChain is a helper for implementing the property page message handler.
+// It takes a NULL-terminated array of Message pointers (could be CSliderValue or CRadioChoice)
+// and calls them in order until one of them sets bHandled.
+
+LRESULT MessageHandlerChain(Handler **ppHandlers, UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);