Refactor qrenderdoc to provide stable, clean and deliberate API

* Note, this API is still in-flux and beta, so there may still be some
  more changes before it's 'stable', and even then it will still be
  subject to some amount of change.
* This API is then exposed to python via SWIG bindings and hides
  internals that don't need to be visible, and means the actual API is
  easier to work with.
* We also use this API to reduce inter-dependencies between different
  windows that need to interact with each other at a high level.
* The naming is python/standard RenderDoc TitleCase method names, not
  Qt style camelCase methods.

# Conflicts:
#	qrenderdoc/Windows/PipelineState/D3D11PipelineStateViewer.cpp
#	qrenderdoc/Windows/TextureViewer.cpp

qrenderdoc/Windows/Dialogs/VirtualFileDialog.h

@@ -31,7 +31,7 @@ namespace Ui
 class VirtualFileDialog;
 }
 
-class CaptureContext;
+struct ICaptureContext;
 class RemoteFileModel;
 class RemoteFileProxy;
 
@@ -40,7 +40,7 @@ class VirtualFileDialog : public QDialog
   Q_OBJECT
 
 public:
-  explicit VirtualFileDialog(CaptureContext &ctx, QWidget *parent = 0);
+  explicit VirtualFileDialog(ICaptureContext &ctx, QWidget *parent = 0);
   ~VirtualFileDialog();
 
   QString chosenPath() { return m_ChosenPath; }