Cycle active window with button

A new button is added to the UI so that we can cycle the currently active window when there are more windows to capture.  It's like pressing the F11 button but it works on Android too.

renderdoc/api/replay/control_types.h

@@ -542,6 +542,9 @@ When valid, will be in the range of 0.0 to 1.0 (0 - 100%). If not valid when a c
 or has finished, it will be -1.0
 )");
   float capProgress = -1.0f;
+
+  DOCUMENT("The number of the capturable windows");
+  uint32_t capturableWindowCount = 0;
 };
 
 DECLARE_REFLECTION_STRUCT(TargetControlMessage);

renderdoc/api/replay/renderdoc_replay.h

@@ -1342,6 +1342,9 @@ The details of the types of messages that can be received are listed under
 )");
   virtual TargetControlMessage ReceiveMessage(RENDERDOC_ProgressCallback progress) = 0;
 
+  DOCUMENT("Cycle the currently active window if there are more windows to capture.");
+  virtual void CycleActiveWindow() = 0;
+
 protected:
   ITargetControl() = default;
   ~ITargetControl() = default;

renderdoc/api/replay/replay_enums.h

@@ -3143,6 +3143,7 @@ enum class TargetControlMessageType : uint32_t
   RegisterAPI,
   NewChild,
   CaptureProgress,
+  CapturableWindowCount
 };
 
 DECLARE_REFLECTION_ENUM(TargetControlMessageType);