[idd] helper: added new helper service

As the IDD itself runs in a WUMDF sandbox, it doesn't have enough
access to perform interactive operations such as moving the cursor.

This helper service communicates with the IDD over a named pipe,
so that we can perform these things, as well as in the future provide
a configuration GUI.

idd/LGCommon/CDebug.h

@@ -0,0 +1,79 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2025 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#pragma once
+
+#include <Windows.h>
+#include <fstream>
+
+class CDebug
+{
+  private:
+    std::ofstream m_stream;
+    void Write(const char * line);
+
+  public:
+
+    enum Level
+    {
+      LEVEL_NONE = 0,
+      LEVEL_INFO,
+      LEVEL_WARN,
+      LEVEL_ERROR,
+      LEVEL_TRACE,
+      LEVEL_FIXME,
+      LEVEL_FATAL,
+      
+      LEVEL_MAX
+    };
+
+    void Init(const char * name);
+    void Log(CDebug::Level level, const char * function, int line, const char * fmt, ...);
+    void LogHR(CDebug::Level level, HRESULT hr, const char* function, int line, const char* fmt, ...);
+
+  private:
+    const char* m_levelStr[LEVEL_MAX] =
+    {
+      " ",
+      "I",
+      "W",
+      "E",
+      "T",
+      "!",
+      "F"
+    };
+};
+
+extern CDebug g_debug;
+
+#define DEBUG_INFO(fmt, ...) g_debug.Log(CDebug::LEVEL_INFO, __FUNCTION__, __LINE__, fmt, ##__VA_ARGS__)
+#define DEBUG_WARN(fmt, ...) g_debug.Log(CDebug::LEVEL_WARN, __FUNCTION__, __LINE__, fmt, ##__VA_ARGS__)
+#define DEBUG_ERROR(fmt, ...) g_debug.Log(CDebug::LEVEL_ERROR, __FUNCTION__, __LINE__, fmt, ##__VA_ARGS__)
+#define DEBUG_TRACE(fmt, ...) g_debug.Log(CDebug::LEVEL_TRACE, __FUNCTION__, __LINE__, fmt, ##__VA_ARGS__)
+#define DEBUG_FIXME(fmt, ...) g_debug.Log(CDebug::LEVEL_FIXME, __FUNCTION__, __LINE__, fmt, ##__VA_ARGS__)
+#define DEBUG_FATAL(fmt, ...) g_debug.Log(CDebug::LEVEL_FATAL, __FUNCTION__, __LINE__, fmt, ##__VA_ARGS__)
+
+
+#define DEBUG_INFO_HR(hr, fmt, ...) g_debug.LogHR(CDebug::LEVEL_INFO, hr, __FUNCTION__, __LINE__, fmt, ##__VA_ARGS__)
+#define DEBUG_WARN_HR(hr, fmt, ...) g_debug.LogHR(CDebug::LEVEL_WARN, hr, __FUNCTION__, __LINE__, fmt, ##__VA_ARGS__)
+#define DEBUG_ERROR_HR(hr, fmt, ...) g_debug.LogHR(CDebug::LEVEL_ERROR, hr, __FUNCTION__, __LINE__, fmt, ##__VA_ARGS__)
+#define DEBUG_TRACE_HR(hr, fmt, ...) g_debug.LogHR(CDebug::LEVEL_TRACE, hr, __FUNCTION__, __LINE__, fmt, ##__VA_ARGS__)
+#define DEBUG_FIXME_HR(hr, fmt, ...) g_debug.LogHR(CDebug::LEVEL_FIXME, hr, __FUNCTION__, __LINE__, fmt, ##__VA_ARGS__)
+#define DEBUG_FATAL_HR(hr, fmt, ...) g_debug.LogHR(CDebug::LEVEL_FATAL, hr, __FUNCTION__, __LINE__, fmt, ##__VA_ARGS__)