Remove direct include of Code/CaptureContext.h in almost all files

* This is a leftover from before the interface was hoisted out, and most
  windows were still calling directly to CaptureContext instead of via
  the public ICaptureContext interface

qrenderdoc/Windows/Dialogs/TextureSaveDialog.cpp

@@ -25,7 +25,6 @@
 #include "TextureSaveDialog.h"
 #include <QColorDialog>
 #include <QFileInfo>
-#include "Code/CaptureContext.h"
 #include "Code/QRDUtils.h"
 #include "ui_TextureSaveDialog.h"