[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/util/CSRWLock.h

@@ -0,0 +1,63 @@
+/**
+ * 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>
+
+class CSRWSharedLock
+{
+private:
+  SRWLOCK * m_lock;
+
+public:
+  explicit CSRWSharedLock(SRWLOCK * lock) : m_lock(lock)
+  {
+    AcquireSRWLockShared(m_lock);
+  }
+
+  ~CSRWSharedLock()
+  {
+    ReleaseSRWLockShared(m_lock);
+  }
+
+  CSRWSharedLock(const CSRWSharedLock&) = delete;
+  CSRWSharedLock& operator=(const CSRWSharedLock&) = delete;
+};
+
+class CSRWExclusiveLock
+{
+private:
+  SRWLOCK * m_lock;
+
+public:
+  explicit CSRWExclusiveLock(SRWLOCK * lock) : m_lock(lock)
+  {
+    AcquireSRWLockExclusive(m_lock);
+  }
+
+  ~CSRWExclusiveLock()
+  {
+    ReleaseSRWLockExclusive(m_lock);
+  }
+
+  CSRWExclusiveLock(const CSRWExclusiveLock&) = delete;
+  CSRWExclusiveLock& operator=(const CSRWExclusiveLock&) = delete;
+};