[idd] driver; support custom resolution and refresh rate list

Custom modes can now be configured via the registry under

HKEY_LOCAL_MACHINE\SOFTWARE\LookingGlass\IDD

Create the value "Modes" as a REG_MULTI_SZ with the value as
a list of modes, for example:

1024x768@60
1920x1080@60
1920x1080@120*

The '*' denotes the preferred mode to default to if one has not
been selected by the user.

idd/LGIdd/CIndirectDeviceContext.h

@@ -26,6 +26,7 @@
 #include <vector>
 
 #include "CIVSHMEM.h"
+#include "CSettings.h"
 
 extern "C" {
   #include "lgmp/host.h"
@@ -87,16 +88,10 @@ private:
   void LGMPTimer();
   void ResendCursor();
 
-  struct DisplayMode
-  {
-    unsigned width;
-    unsigned height;
-    unsigned refresh;
-    bool     preferred;
-  };
-  std::vector<DisplayMode> m_displayModes;
-  DisplayMode m_customMode    = {};
-  bool        m_setCustomMode = false;
+  CSettings::DisplayModes m_displayModes;
+
+  CSettings::DisplayMode m_setMode;
+  bool m_doSetMode;
 
 public:
   CIndirectDeviceContext(_In_ WDFDEVICE wdfDevice) :
@@ -106,7 +101,7 @@ public:
 
   bool SetupLGMP(size_t alignSize);
 
-  void PopulateDefaultModes(bool setDefaultMode);
+  void PopulateDefaultModes();
   void InitAdapter();
   void FinishInit(UINT connectorIndex);
   void ReplugMonitor();