[idd] project: organize driver sources by responsibility

Group the IDD sources and Visual Studio filters by subsystem.

Split the device and swap-chain implementations into focused units,
rename the context classes, and reduce header coupling.

idd/LGIdd/display/CEdid.h

@@ -0,0 +1,59 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2026 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 <stdint.h>
+#include <vector>
+
+#include "config/CSettings.h"
+
+class CEdid
+{
+public:
+  struct Timing
+  {
+    DWORD  hActive;
+    DWORD  hBlank;
+    DWORD  hFront;
+    DWORD  hSync;
+    DWORD  vActive;
+    DWORD  vBlank;
+    DWORD  vFront;
+    DWORD  vSync;
+    UINT64 pixelClock;
+  };
+
+  void Build(bool hdr);
+
+  static bool GetTiming(Timing& timing,
+    const CSettings::DisplayMode& mode);
+
+  const BYTE* Data() const { return m_data.empty() ? nullptr : m_data.data(); }
+  UINT Size() const { return (UINT)m_data.size(); }
+
+private:
+  std::vector<BYTE> m_data;
+
+  static void SetChecksum(BYTE* block);
+  static bool WriteDetailedTiming(BYTE* dtd, const CSettings::DisplayMode& mode);
+  static void WriteMonitorName(BYTE* desc, const char* name);
+};